Screw it I'm over spoiler tags.
Do you really think Xavier would mind control people just because it suited him?
When faced with the extermination of mutants via invulnerable Sentinels? Yes, hell yes.
He's done shady shit with his powers before in the comics. For example:
-Making the X-Men think he lost his powers just to test them
-Letting Wolverine attempt to assassinate him because he knew he could break Wolverine’s conditioning and then have him be a weapon for Xavier, instead.
-Keeping the Danger Room’s sentience a secret
-Not letting Cyclops and Havok know that they had a brother
-Being a member of the Illuminati ... In a perfect circle jerk of arrogance, the Illuminati secretly guided the course of some of the most important events of the last 20 years. Tony Stark, Reed Richards, Blackbolt, Namor, Dr. Strange and of course Charles Xavier met in a dank basement and made everyone else's decisions for the them while patting themselves on the back. Of course, it was only a matter of time before the biggest dicks around made a fatal mistake. Blasting the Hulk into space, they felt their work was done and they could get back to talking about how awesome they were. But when ol' Jade Jaws returned to put his foot up New York's ass during the World War Hulk crossover event, Xavier claimed he didn't know about the exile decision and pulled a France and surrendered.
-Faking his own death and not telling all but one of his students
-Wiping the memory of Cyclops of the team of X-Men who died between the original X-Men and the All-New, All-Different X-Men.
-Condoning Jean’s mind wipe of Kitty’s parents in the run-up to Jean becoming Dark Phoenix
-Lying to everyone and saying that Moira was a housekeeper he’d just hired. Later... After sharing a kiss with Charles at his mansion and christening his new team the X-Men, he erased her memory of their location so that she could not reveal it to the CIA, nor be made to tell them.
-Paty, wife of the late great Dave Cockrum, once told Chris Claremont that she felt Xavier really was a criminal, because he was lying to all the parents of his first class of students, promising that they would be getting a top notch education. Instead, he was taking a bunch of teenagers, forming them into a covert strikeforce, and training them to go out and fight dangerous super-powered criminals. Magneto, for all his sins, at least was not hiding behind the facade of the benign, kindly human educator, and was totally up front that his Mutant Brotherhood was a terrorist group. ...​Imagine you are a mutant teenager. Everyone hates you, you hate yourself, and everyone thinks you are dangerous, including you. You feel like you have nowhere to turn, and no one who will ever understand you. And then a bald man in a wheelchair comes to you and says he has all the answers, that he can help. He tells you that he runs a school for people like you, where you can be free to be yourself and you will be protected. You leave your family and move to a huge mansion where there are other kids like you, and everything seems okay, for once in your life. Then, all of a sudden, a giant robot attacks your new home and vaporizes a bunch of your friends. An angry mob is outside calling for your head. The bald guy in the wheelchair is now telling you that you need to strap on some tights and gives you a silly code name. You are now forced to fight for him, training yourself to use your powers for his private army. You fight against other mutants, against humans, monsters, whatever. You are flown off into outer space and the far future and all over the world, getting tossed around from team to team where most of your friends are eventually killed or de-powered or forgotten about. Meanwhile, the man who you are doing this for, this man you put all your trust in, disappears because he gets depressed or wants to bone his space alien girlfriend. Does that sound like a nice thing to do?
-And it’s worth mentioning the fact that, especially in the Silver Age, there wasn’t a memory around that Xavier wouldn’t alter. ... I was JUST reading X-Men 1-10 and was marveling (guffaw) at what a dick Xavier was. Not really a lie (just highly unethical), but also: he sure was fond of mind wiping people back then for trivial stuff. He mind wipes an entire circus for gods sake!
-Making the Xavier Protocols: ​When you lead a band of super-powered young people, it's a safe bet that one or two of them will turn bad. That's just what Charles Xavier thought. During the "Onslaught" crossover, it was revealed that Charles had created the Xavier Protocols. These were files detailing ways to defeat the world's most powerful mutants that he kept in secret in case any of them needed to be taken down. The mutant hating Bastion eventually got a hold of them, and it almost got everyone killed. Good idea, Charlie, but poor execution. Y'know, Batman did the same thing once in the pages of JLA, and it didn't work out so well for him either.
-Actually, I do kind of blame Claremont for this, because in many interviews he’s made the point that Charles Xavier is a jerk and a manipulator and completely ruthless. I think that penetrated the consciousness of everyone who’s come on the book since.
-One of my personal favorites is Uncanny X-Men 375. Prof. X “suspects” one of the X-Men is a skrull infiltrator, so he does a mass mind hallucination where he makes all the X-Men either kill their teammates and/or bear witness to their friends dying (which would probably have a lasting psychological trauma for everyone involved). Then at the end, Beast calls down from where he and Moira were doing an autopsy on the deceased Logan and let’s everyone know Logan was the skrull. To which Xavier responds ‘…as I suspected all along’ (or something similar, I’m paraphrasing). So rather than waiting 90 minutes or so for Hank to confirm his suspicions, he thought it would be the perfect opportunity to mindf–k all of his students.
-You left off the time when Xavier tried to use his powers to force Amelia Voght from leaving him, or when Xavier admitted that he lied to Rogue about helping her control her powers when she first joined the X-Men.
http://goodcomics.comicbookresources.com/2010/09/22/top-five-lies-by-professor-x/
http://marvel.wikia.com/Moira_MacTaggert_(Earth-10005)
http://www.toplessrobot.com/2010/06/8_of_professor_xs_many_many_dick_moves.php
You seriously don't think Professor X would mind erase Nixon or Trask for the greater good of the world? Ok. I think he would do it just so they do whatever the hell he wants them to, but in his own "good" and "moral" way which is probably better than Magneto's way.