And used his fame to help many afflicted by the disease.

So?

Does that make him a really bad person, sure he is a cheat, arrogant prick and an arsehole but do we throw out the good cause of the bad?

I'm not condoning what he did but IMO there are plenty of worse criminals/ people out there. Either way as a bike fan I'm disgusted in him but as a person I can't help think he is just a really flawed character, with some misguided moral, values etc but somehow has still helped put in a place a network to help people afflicted by the most horrible of diseases?
Gee the world is a confusing place sometimes?