I flash my headlights at cars whose lights are too blinding, under the assumption that the driver accidentally left their brights on.

If I’m wrong and their lights are always like that, my assumption is that they would appreciate someone letting them know anyway. If it happens a lot, maybe they’ll figure it out and correct their embarrassing problem.

And if they’ve jerks who know they’re blinding others but just don’t care (or savor it) oh well they should still hear about it.