Here’s the article I alluded to: https://joycearthur.com/abortion/the-only-moral-abortion-is-my-abortion/

I’m not sure it explains it, but it dives into the phenomenon.

My best guess is that it’s similar to how people feel they are good drivers and can use their phones while driving but no one else should. Or driving drunk. “Just this once is okay. I’ll be careful.”

The critical thing to understand is that this isn’t a change of heart. There’s no real regret here. It’s “it was okay for me but not for you.”