personally i think that if abortions become illegal it should in turn become legal to force men to adopt unwanted babies and care for them until they're 18
There is actually a coherent argument about that as an extension of pro-choice. For example, a woman consenting to sex isn't automatically consenting to having, paying for, or raising a baby. So, should a man be forced to pay for a child he didn't want - which is the same as saying he didn't automatically consent to making a baby when he consented to sex. If you say to the man "if you didn't want the risk of paying for a baby you shouldn't have had sex" then that's not coherent since we'd be horrified if anyone said that to a woman. Saying that "take responsibility" argument to a woman as to why she must raise and support the baby she made would be considered the worst possible right-wing sort of bullshit, so it's not really coherent to use that sort of logic only when it's convenient.
The woman can say she wants to abort, adopt or keep the baby, and she has a level of future responsibility based on her choice in the matter. However, if the woman wants to keep the baby, and the man tells her to either abort or adopt it away, we would view him as an absolute monster. Basically any time the man's choice in the matter doesn't automatically match the woman's choice, we say his opinion on the matter is irrelevant a best, or just plain evil for disagreeing. In other words, the choice was not his, and responsibility without choice is fundamentally anti-choice.
Sure, men should do the right thing out of choice, too. However, if the choice is compelled it's not longer a choice and it loses all meaning, which ultimately devalues the choice to do the right thing.
EDIT: I'll point out that part of the meta-narrative is that if someone is compelled to pay child support if they leave a relationship, we absolutely do have to view that not just as a compelled payment, but legally mandated manipulation to make someone stay in the relationship, with financial penalties for not complying. If someone tells you that if you leave, then they'll get the system to force you to pay them, then that's a pretty unhealthy dynamic to enshrine in law.