OK, I've passed the half-century mark, and there have been crazies on both sides, from the raving commies of the Weather Underground and misnamed SDS, to the militia/survivalist movement. (Almost invariably, it was the leftists who engaged in actual criminal violence, whereas the K-Mart Commandos on the right just talked a lot.)
But the real difference I've seen as I've aged is that the mass media today isn't even pretending to be objective any more. In the past, sure, there was bias, but it was subtle rather than overt. No more.
Also, much of the mass media really is anti-American today. For example, during Desert Storm, General Schwartzkopf wanted to fake out the Iraqi army, and figured out the best way to feed "disinformation" to Saddam & Co. was to call in American reporters for a "secret" briefing, tell them US lives were at stake, and then present the fake battle plan as if it were real. Sure enough, it leaked - and Saddam acted on the fake info. Schwartzkopf was able to put trust in the duplicity of the US media to deceive the enemy - and during a press conference, he told them so.
This has been known for quite a while. Before Desert Storm, Cap Weinberger was giving a press conference about our operations in Grenada. One reporter asked him with a tradition of reporters going with the troops in WWII on D-Day and other operations, and in view of Ernie Pyle's famous reports from the front, why was the media cut off from covering Grenada?
After a few second's pause, Weinberger said, in the most matter-of-fact tone of voice possible, "In those days, you were on OUR side."
(BTW, if you didn't see or hear these live . . . odds are you didn't see or hear these at all.)