You might consider this akin to parents being uncomfortable discussing certain topics with their children - much like many parents feel uncomfortable discussing

You might consider this akin to parents being uncomfortable discussing certain topics with their children - much like many parents feel uncomfortable discussing topics about sex and sexual practices here in North America. It's not necessarily that it's forbidden, it's just that many people have been made to feel awkward and uncomfortable discussing sex. I imagine the same mechanism of guilt is at play all over the world for various topics.