Why do people act like *** klowns on the road.

I drive the NJTP often and the unsafe manner in the way some people drive never ceases to amaze me and thats to say nothing of the drivers we see texting. The speed limit is 65 and I usually keep it at under 75, yet I have drivers passing me like im standing still. Some years ago a kid was driving recklessly and a few minutes later traffic slowed way down. He had clipped a family in a mini van and put that vehicle into the divider, his car had the front end totalled
Luckily nobody was seriously injured
I was cutoff by a driver a few weeks back, I was in the middle lane to pass a slower moving vehicle. I wasnt doing much more than 65 when a car came up fast on the left lane and cut me off to pass the car in front of him
I was driving a almost new small SUV that handles well but at 65 when you serve to avoid a collision it can real dicey fast, its unnerving and you'd have better have two hands on the wheel
Stay safe out there please