When famous people get accused of something really bad, as long as there is even a little uncertainty of their guilt (and there doesn't need to be much), there are fans that are so loyal that they actually start rooting for the famous person even more than ever. This has happened with the following:
OJ Simpson - people actually celebrated him getting off despite pretty clear guilt
Michael Jackson - his real fans would not accept the pedophile charges, claiming victims were lying
Michael Vick - not so much deniers here, but his hardcore fans dismissed dogs and made every possible comparison with people who got lesser penalties from minor crimes against humans, as a support for Vick
Chris Brown - some of his fans actually blamed Rihanna
And all these people that cheer and support these accused people and besmirch the accuser - well a vast majority of them don't even know these famous people or their accusers, but since MJ's songs were good he must be innocent you know. And cause Cosby is funny and plays a nice guy on TV, well clearly then he can't be a rapist.