Why couldn't he just say it's both? Why is the male side of it "the real problem?" The rapes and sexual assaults were probably the worst things to go down, and you can definitely be honest that it was the men doing most of that. However, the honest take is that hypersexual and bad behavior from both men and women is what led to Freaknik devolving into what it became.
Well for one because there's a big difference between "hypersexual behavior" aka twerking and dancing suggestively vs rape. So trying to put them on the same level isn't smart. And also probably a combination of still being in a time where despite what people think rape and sexual assaults still aren't believed by many and a myriad of excuses are given and victim blamimg is done, see the current discourse around this topic.