Dr. Williams nails it as usual. Back when I was on the beat, I felt I had more important things to do than worry about who was wearing seat belts. Hell, even aggressive drunk driving enforcement was more defensible than this crap.
Apparently the current crop of law enforcement bureaucrats does not share your assessment of this crap. It has long been my contention that people who go into police work are not the sort that think any laws are stupid, useless or downright evil, but take satisfaction in catching violators of every and any thing. This attitude explains why the French police were vigorous in rounding up Jews and turning them over to the Nazis - it was the law. They didn't see anything wrong with what they were doing.