Ignorance is bliss.
There are regulations and those tasked with enforcing them usually have better things to do. I'm not advocating annual inspections but for some, it should be a thing. Either because they are clueless how to operate & maintain the 7000 weapon they daily drive or have modified it to be more dangerous to them and everyone else on the road. When I lived in OH, we only had smog inspections to make the EPA feel better about themselves and eventually it became free (taxpayer funded). I feel for the LEOs, underpaid and overworked so why would they bother with a squatted truck having headlights aimed to hit billboards when the driver has a 99% chance of giving them attitude.
I would bet 99.9% of new vehicles are going through QC checks that do in fact have the headlights aimed where they're supposed to be. Bouncing down poorly or non-maintained roads or having bubba install the latest, greatest 18" lift kit are both likely to keep the headlights aimed somewhere other than they were from the factory.
At some point the government (at some level) has to step in, if it were purely wild west, you could just shoot out the lights of the offending high beam driver, it's not. Their ignorance, incompetence or arrogance unfortunately need protection along with those who weren't put on this earth to be a burden to society.