You've not proven anything as fact nor provided any evidence as such. Just because you say it is a fact does not make it so. All that's been referenced as evidence is a few threads by a few people that claim there is a toxic mentor problem, yet in these same threads when you look through the pages of posts, there are more individuals responding that no there isn't a bigger problem and if someone is being toxic, report them. It gets annoying seeing these "I ran into a mean mentor. We need to abolish the whole mentor system!" threads popping up from time to time.