The best comparison I can make of this is to Jimmy Savile, the English TV star. In his lifetime, everyone knew he was an eccentric. What they eventually found out was that he wasn't just an eccentric, he was a pervert who used his position at the BBC to lure targets. Unfortunately, this wasn't discovered until after he died.
Trump's lurid behavior is being exposed at the worst possible time for him, just as the most powerful office in the free world seemed to be within his reach.