Not only do they visibly diminish the light output from their headlights (doesn't seem to bother them), but they also create vast amounts of glare to other drivers. Not to mention the fact that if they're aimed incorrectly, then other drivers are rendered blind from this shit.
Cops need to enforce the law regarding after market xenon's (and I use that term loosely) more often.
The key to winning is knowing how to play the game. I am diabolically clever and can piss further than you can think...I always win.