I had to look this up. Why would anyone do that? Not only does it look idiotic, but it probably messes with the crash safety technology of the car (in addition to the headlight problem).
Everyone in the car community not actively doing this also thinks it's stupid. It's objectively stupid and dangerous. The people doing it do it primarily because it's stupid and dangerous, similar to those in the "stance" community. They do it basically to get attention, even if that attention is negative, and to openly show that they have a disregard for others as for some reason American society rewards and uplifts anti-social behavior.
It's people who modify their cars to run as much camber as possible and run wide wheels with narrow tires stretched onto them so you're driving on a rubber-band width contact patch that is actually part of the tire's sidewall.
People who are into stance consider it an accolade if you can drive your car for some time and leave the stickers on the tires on (which are supposed to be removed during installation) and not have them rub off, because the contact patch is so narrow.
It's stupid, it's dangerous, and therefore it gets a lot of hate. Hate is attention, so insecure people who are afraid to actually get good at modifying and driving cars will do stance instead because it's formulaic and obvious what will get you accepted into the subcommunity and it gets lots of negative attention (which is still attention) everywhere else.
They do it for attention. Wearing a hat sideways looks stupid but for those who are addicted to attention, it is worthwhile. There's also a degree of chest thumping, showing that the attention seeker isn't afraid of defying society's expectations.
I had to look this up. Why would anyone do that? Not only does it look idiotic, but it probably messes with the crash safety technology of the car (in addition to the headlight problem).