Why do so many black men on TV shave their heads?

I think because a lot of black men are of mixed races and their hair is always a dead give-away as to their African roots. Same reason that black women use lace front wigs...it hides the nappy roots. I am white and my black girlfriends and I have really honest discussions about cultural differences. The black girls feel that when black men shave their heads, they look less black and can keep white girls guessing about their race. Nuts, I know, but it's what they tell me.