So you see the main benefit of thumbs is rape? that's honestly insane and I might offer some advice to keep that thought to yourself because you will be judged harshly for it
I think those leaps underline how taboo the topic is.
So the only conceivable reasons to raise such a bizarre topic all involve you being a very unpleasant person to converse with -- the most generous I can think of being an unearned sense of intellectual superiority simply by the fact of raising an idea you see as taboo.
For instance there has recently been a lot of controversy around the claim by J.K. Rowling that studies show that transgender males have the same rates of sexual predation as other males. Understanding of the balance of biological versus social influence informs that debate.
To improve our selves we must know our selves.