I suspected the campaign of collusion via oligarchs and other private citizens who were close to Putin and other government officials. And I think there were only a few bumbling attempts at coordination. But they (Trump, his kids and family and his collection of grifters) were all too terminally stupid to pull it off. And, being terminally stupid, they bragged about it and exaggerated and took credit loudly for criminal acts they didn’t even do (maybe). So even if they got off, they deserved every second of the ride. And the whole episode shows that corrupt villains flock to Trump like moths to a flame. It paints him as a malleable fool. And they are spinning this into a victory. Go figure...
I can see how it would be difficult for Mueller to make the case that association with private Russian citizens is the same as association with the Russian government. But I’m surprised he didn’t find a way to charge the Trump Tower meeting, because he seemed pretty adept at finding charges in the other branches of the case. I’m a little surprised he let it go, but charging Traitor Tot would’ve been like kicking a bear in the balls for no good reason except that a lot of people want to see that particular bear kicked in the balls. But I can understand not wanting to be the ball kicker. And the bear would just pardon his cub anyway and you’d have to deal with a lifetime of pissed off bear tweets.
At the end of the day it's always a political question, because Trump has obstructed justice. The fact that he does it publicly somehow obscures it, but it's obstruction of justice to say that the Justice Department investigation is just a bunch of Angry Democrats on a witch hunt, that Mueller was appointed illegally, that people shouldn't trust that an impartial investigation can exist. Even repeatedly insulting and belittling AG Sessions falls under that. I wouldn't be at all surprised if Mueller's full report mentions all this stuff, and then just points out that Trump is a complete asshole in all respects of his life and it would be hard to prove mens rea since he acts like this all the time anyway (the same logic as to why it's so hard to prove that Trump defames anybody).