If it wasn't true, there would have to be a Simpson's paradox of epic proportions to account for the improved mental health outcomes of anti-abortion-aligned demographics. Pro-abortion republicans would have to be the happiest people in the world by a huge margin.

This isn't an argument about whether abortion is moral. Please don't bring this down to an object-level argument about abortion - I have zero interest in that. This is about the psychological states of groups who believe in the presence of an urgent moral crisis.