It ain't really "black women want thugs", but more like why does the black woman I want want thugs?
A lot of times that 'thug over gentleman' stuff is nonsense. The dude that proclaims himself to be a gentleman is dressed wack, chills in the friend zone and tries to upgrade on a woman, etc. If you dress well, got a solid talk game, etc., it's gonna be some black females liking you. But a lot of times these guys see this fine hoodrat or see a woman that has a proclivity for thugs and get attracted and then wonder why THAT female ain't paying them no mind. Everybody got preferences. If you a vegetable, stop trying to holler at the woman that wants steak.
Now there ARE black women that want thugs and you simply have to let them reap the fruit of their actions, even if they are fine. But if you stay sharp, you'll have nice black women on you as well.