The OP said, "The real problem is that, at least in the US, no one seems to care about keeping their headlights aimed properly..." I'm only pointing out that proper adjustment isn't the issue.

The matter of HID headlight annoyance is well-trodden territory in automotive circles. Owning a car with them equipped, I appreciate the additional visibility. On the flip side, living in an area where they are common, I appreciate that they can be blinding if you're caught in the beam.