honestly, i'm shocked.
europe usually doesn't have restrictions like that.
I think you should be allowed to do whatever you want. Wearing a helmet is obviously the smarter option, but if you don't want to wear one, that is your prerogative.
personally, i go both ways. spent almost all of last season cruisin without a helmet. have definately worn it more, and got a concussion with one on this season, so i've become more inclined to keep the dome protected.