I can't speak for the GP, but it's (apparent) popularity worries me. It is a brutal sport, with some of the dregs of society participating at the highest levels (here's an interview between two competitors: https://www.youtube.com/watch?v=eTzhVVIjLCE). I don't think I would have an issue with UFC etc. if the fighters could show a little class and some respect for each other. As it stands I think it supplies very bad role-models for teenage and 20 year old males it is surely popular with.