I'll have to disagree with Kev. It's not necessarily true that sportbike riders believe more or less in gear than cruiser riders.
Granted, stating the obvious, sportbikes and "leathers" realistically should go hand in hand, but hell, look at all those stunting videos you see at your local shop. How many of those guys are wearing proper gear? Tank tops, shorts, NO HELMET, etc. Most of the locals here don't wear gear (unless we're talking canyon carvers, then the numbers go up towards 75%). When it's wet out, them boys (and girls) put those wheels away and grab the keys to the cage.
As far as the cruiser riders go, I think they are in a world of their own. There is a sort of seperation between sportbikers and cruisers. Do they deserve more or less flack? I don't think so, but well, I know lots of those guys are against helmet laws. What makes you think they care about leathers?