Bill is not unlike others of his mold: basically a big bully who has gotten everything to go his way for his entire life. His downfall was a cumulative effect of how he lived his life:
Ivy League educated. How he got into Harvard is anybody's guess, based on his background. He grew up in a working class neighborhood in Leavitttown, NY, with a working class father scratching out a living. But once he graduated from Harvard, he had that arrogance that all the Ivy League schools imbue in their graduates: they are our betters, they know everything and should be given whatever they want in life. These Ivy Leaguers are for the most part insufferable. And Bill O'Reilly is no exception. I hate Ivy League graduates.
He is a good looking guy. It's no secret that good looking people have a leg up in society. Notice that there are no bald, fat, short people reporting the evening news. No, that just will never happen. As he got older, he got uglier (don't we all), but in his youth he was a dashing figure, and he moved to the front of the line at all times, whatever line he wanted to cut. I hate good looking people.
He is 6'4" tall. Tall people always seem to think that because they can look over the crowd without a step stool, they know everything. It starts in grade school or junior high: once these guys get to be that big, they assume the 'bull of the woods' mentality: don't you know I'm bigger than you? And because I'm bigger than you, I am right and you are wrong. True, not every tall guy is like this, but most are, or at least most tall guys that are 6'4" or taller that I've ever known are. All these tall guys were born on third base and think they hit a triple. I hate tall guys.
And finally, he got wildly rich and famous. That was the final nail in the coffin for Ivy League educated, good looking tall guys. They think their poop doesn't stink. I hate wildly rich and famous guys.
Bill O'Reilly had all of these things 'going for him,' or so he thought. He would yell down his guests when they started getting the best of him, such as Barney Frank and Geraldo Rivera. Screaming matches is how these guys get their way. And with women, they just assume since they are Ivy League educated, good looking and tall, the girls will just swoon as they work their magic.
In Bill's case, a few of these gals he ran into didn't buy into all of his charms, and probably told him to go pound sand. Big, Ivy League educated handsome tall guys don't put up with that, and his handlers had to pay up some significant monetary settlements to smooth over his misdeeds.
I will not miss Bill O'Reilly. He was a big, nasty bully, and finally was held to account.