Because men cannot get abortions.
Men can have cancerous tumors removed from their bodies at their own behest.
Men get no (or very little) power and so have consequently little responsibility.
You're right, men are not responsible for incubating a fetus. Did you discover this all by yourself, big guy?
A woman is free to abort a man's fetus without his consent.
Because what she does with her body is her business, and no business of any man's or any fetus's. WTF would she need his consent for? Do you have to ask permission to get your teeth pulled?
But I guess other people having the power to destroy your stuff is scot-free huh?
I completely support your right to take over gestational responsibilities from any woman who no longer wants to continue her pregnancy. We'll remove the fetus from her and stick it in you, sound good?
It is an equally reasonable position to say that men and women have equal power over the fetus and equal responsibility. But if you are going to give women 100% power over it then they get 100% responsibility.
See, the problem here is that you do not view women as people. You see them as incubators. Idle baby factories, meant to process a man's input and deliver him the output. A woman's personal bodily rights simply do not exist in your view. That is why people point out how pathetically and despicably misogynistic you are. You have a pathetic and despicable hatred of women.
Maybe mommy didn't cuddle you enough, or maybe the pretty girl laughed at you when you asked her to dance in junior high... whatever it was, it's time to grow up and realize that women are people, too. If you want to go have your appendix removed, or donate a kidney, or excise a mole, or pierce your nipple, you get to decide that on your own. Nobody can force you to give your brother one of your kidneys. Nobody can put holes in your ears without your express permission. When you understand why you have the right to say "no" to kidney donation or an appendectomy, you'll understand why women have the right to terminate their pregnancy.
Unfortunately, that will only be possible when you realize that women are people, and you don't seem like the type that learns very fast.