A lot of drivers are in an “entertainment bubble” - they are messing with the radio, or texting, etc. Some drivers tailgate even when there is plenty of room for the cars to be spread out. A lot of drivers don’t seem to look very far ahead at all. All they are aware of is the car immediately ahead of them that they are tailgating. Even if you drive fast (above the speed limit but still something safe) people will tailgate. Add to that oblivious people who drive slow in the left lane.
It seems like it has really become worse in the last 5-10 years. If a problem driver is young I think cell phone distraction or booze and drugs, if they are old I think they are completely gakked out on their rx medication.
Freegards