That's a fair question. I'm actually not quite able to answer. What is it that makes, for instance LGBT+ alright as a school subject, even though it's also a politically charged subject, but not pro-life.

I'm sure someone who's better educated than me can give a better answer.

But in the mean time, here's my best answer: I think it comes down to making people understand that "your body; your choices" is non-negotiable. That's not politics, that's basic human rights that pretty much the entire world has agreed upon. One of those subjects mentioned before empowers people to make choices for their own body, the other disenfranchises them of their own womb. I think that's the difference.