I don't think anyone is arguing that your example of an abortion should be banned, but aborting a 9 month old fetus because you changed your mind, or repeatedly using abortions because birth control is too difficult is not cool by me. Those are wildly different scenarios, and just maybe, a one size fits all solution doesn't work. And why would anyone be against the day after pill? Just like most, I only don't want to have to pay for someone else's poor life choices. I don't know, but I imagine here in Canada, the day after pill is probably provided free of charge, while someone that needs an epi pen has to pay full price.
Kristian