That's because there is no governance for aiming headlights properly. It's usually done by dealers who don't care.

Most headlight issues are because people have retrofitted improper lights into their factory casings. different light sources project light in different patterns so if you put an LED or an HID bulb in a halogen housing it will blind the fuck out of everyone.
But at the same time if headlights aren't aimed properly they'll just blind anyone anyway regardless of the light pattern.
On top of that really tall vehicles, even when aimed properly, still aim their headlights directly into your eyes just because of how high above the ground they are.

Very little of the blinding headlights issues are due to the source of the light.