system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: If men got pregnant and gender roles stayed the same, then abortion would probably be illegal and child birth probably mandated.

I've regularly seen a sentiment online like "If men got pregnant, and gender roles stayed the same, then abortion would be free and cheap for all" presumably because men have group power and group consciousness, and will exercise their group power to stop themselves from having unpleasant and painful obligations. 

But I don't think this is true. Whenever in history there's been a political choice between men having autonomy and men being forced to sacrifice themselves for the state, men have been forced to sacrifice themselves. 

Militias? Men were summoned. Wars? Men were conscripted. Taxes on being childless? Men. Work levies? Men. Obligation for Marital debt? Men. Even with childbirth, women tend to have financial abortion options with the chance to adopt the child at birth without parental consent, and men don't.

Whenever there's been an unpleasant public job to do, the state has been happy to sacrifice men, and men haven't freed themselves from it. 

If a magical alien came and waved a wand on society and everything else stayed the same except men got pregnant, and so gender roles were the same and such, I would expect the opposite. 

Pregnancy would be mandated for men, for the national good, with fines or imprisonment for men who refused, or in more liberal democracies simply strongly encouraged with fines and social pressure. That's what has happened in the past when men went against the public good to protect their bodies. 

Opposition groups would likely be like anti war protestors. Mostly ignored so your side can wage righteous wars, except when it's politically expedient. 

This is because people tend to care less about men, and want them to sacrifice themselves for the state more. 

To change my view, show that society has on other matters let men go free when there was a choice between bodily autonomy and state benefits, or show that this is a bad comparison for some reason.

Edit. Since people have really pushed the boundaries of this hypothetical scenario, a clearer statement would be something like "In countries where there are strong anti abortion groups, if men got pregnant and gender roles stayed the same otherwise they would tend towards anti abortion laws, and when the state benefited from child birth, men would likely be forced to give birth, or strongly encouraged, as they are with military service."
gpt
Historically speaking men have been the working class and women have been the caring class.

This why men have been sent to war (because losing men is not as important for population growth as losing women), done labor (because again women have tended to home and children) and all other things you said. This has been historical gender roles. This is also why men still earn more than women and why men are often considered breadwinners.

Breadwinners will choose to take career over family leave. If breadwinner gets pregnant that's almost one and half year minimum that you will not advance on your career or be able to feed your family. Breadwinner stays at work and wins that bread.

Now if this change comes overnight without anything else changing, already powerful career oriented men would stay career oriented. Therefore there is no room for unwanted pregnancy that would hinder that. There would be abortion kiosks on every street corner.