Throughout Europe it's either straight prohibited to retrofit LEDs in place of halogen bulbs, or it requires special certification where beam patterns are checked.
The policy is probably the de facto assumption that driving is a right: the United States has been rebuilt around the need to drive everywhere and the entire system tends to implicitly assume that anything which would impede someone from driving is unconscionable unless you get to the point of a serious collision or fatality.
The vast majority of states don't even have safety inspections, and some have recently discontinued them.
They take away driver licenses all the time in the US though. DUIs being the most notable, but even getting enough tickets can result in losing your license, or having it suspended. I know at least a dozen people who lost their license at some point.
Sadly this is not the case with headlights and most of things in the US… unless youre a minority, then you cant even walk down the street without being worried.
That's why it is penalized by driving license cancellation in some countries. And people do get stopped for too bright headlights, because it's so easy to notice and check.
While there are guides available on adjusting headlights, they can only help so much when there's a bad combination of LED bulb, halogen housing, and high headlight height. Merely angling the housing downwards won't solve the problem of improper equipment combinations. Wish places like AutoZone offered free or inexpensive a beam pattern analysis service like they do with checking batteries and error codes. Lots of people don't even know their bulb swap is causing problems for others.