Why can't people learn to drive?

On the average driving day coming to work from Cardston to Lethbridge and return there are at least 3 or 4 driving incidents that frustrate me to no end. Why are people allowed to even drive when they drive the way they do. There is one lady that tailgates me quite often in her Volkswagon Jetta, she is an older lady and heaven forbid if she gets behind ya, she just sits right on your bumper. One day I think I made her crap her pants tho, cause I slammed on my brakes. Had she hit me I would have said a coyote ran out in front of me and I had to brake. But instead she slammed on her brakes and had this scared look on her face like she was gonna hit something. I watched all this in my rear view mirror as she was so close. That seemed to work for the rest of the trip to Cardston...but a week later there she was again.

Then there are the guys that have to pass to get ahead of you just to arrive at the Cardston highway corner at the same time you arrive, or the guy that passes you just to turn off 1000 feet ahead...so like why can't they wait 4 seconds to turn?

Then there are the idiot drivers that pass you on double solid lines when there are oncoming cars and you have to slam on your brakes so they can get back in front of you, or the guy who passes and the oncoming car has to move onto the shoulder so he does not get hit.

Oh and how about the guy who passes you and then slows down so that you have to pass them again to maintain the speed limit.

There are so many bad drivers on the road, and the only time you see the cops are when it is their break time sitting at coffee and donut shops.