I'm unsure why you would think the idea that men are attracted to female breasts an "uncomfortable truth".

That's not exactly news.

The idea that that attraction is driving evolution isn't an uncomfortable truth either. It's just more mancentric ridiculous bullshit. That's not how evolution works. You cannot change evolutionary theory willynilly by attaching it to the word psychology just because you want to be edgy or whatever and perform your boldness by embracing "uncomfortable truths".