Presumably one of the cool things about being a billionaire is you have access to interesting people. I mean, almost without exception, he could call up anyone in the world meet and have dinner or whatever. Authors, physicists, politicians, rock stars, religious figures. You could fill your entire social schedule with that, if it was your jam. And he chose to hang out with a guy who was a known (at the very least, Gates was on notice that he might be a) pedophile.
Despicable.