Uh, I think it has a lot more to do with the sexual harassment than being childless. Plenty of people without kids don't have this problem, and it's kind of silly to frame it as "well if he only had kids then he'd be fine..."

Yes, the sexual issues, harrasment or otherwise, are the reason he has trouble doing presentations in high schools.

The childless issue is what makes this so important for him personally, otherwise I believe it wouldn't have been so pressing a matter for him to engage in a crusade. It's his chosen way to engage with the new generation, and he has lost access to it.