It's a war that has to be fought. It's like...hmm, it's like "racism is great" vs "racism is awful". These two opinions can't really exist in society in large numbers simultaneously without explosive results. Eventually, one side has to win. That's the only way you get peace.

That's the way I see it, anyway.

edit: an example, and a counter-example. Gay marriage is the example: there was never going to be a steady equilibrium reached of roughly half the US opposed and half the US in favor. One side had to win the fight and settle the issue.

On the other hand, abortion seems kind of similar and has in fact been in a fairly steady equilibrium in terms of public support. I think that may be because it's less one issue than two: the right to life of a fetus + bodily autonomy.