For years I ran 5 miles a day, with other runners. Had to quit when I hurt my ankle. I always felt good while running. "Runners high," we called it. Endorphins flooding the bloodstream. Other runners always friendly and well-behaved.
I used to join other ham radio operators to provide communications for a marathon run in a nearby town. We'd be stationed at the water points to report on runners needing help, etc. Never saw an ill-behaved runner.
I can't say bad behavior never happens, but I had ample opportunity to observe it, and didn't see it.
Are you in a red state? This could be blue state behavior, I suppose.