Here are two situations where it creates more safety:

1. when it's raining and you have silver / gray vehicle approaching... almost hit a silver car in this situation in my first car (325e), making a left during heavy rain... I couldn't see the silver car approaching until about 20 ft and was lucky to not hit it

2. idiots who don't turn on their lights at dusk or dawn

You can legislate both of these (and, in fact, you are required to have your headlights on in these situations in many jurisdictions). However, there will always be idiots out there who don't.

I sympathize with the motorcycle riders who object to the loss of visibility they get but I think, on the whole, it creates more safety.