It's hard to learn unsavory things about our heroes. We don't want them to be true. That's only natural. And, often, the emotions involved mean that you're more likely to look for holes and dismiss things that don't add up to match your beliefs.
There are few figures that have become as polarizing as Michael Jackson. He was absolutely the biggest singer on the planet in the '80s. But for almost as long as he's been at the top of the heap, allegations have continued to dog him. Maybe that's because he was at the top of the heap, but the rumors just haven't gone away.