they are a danger to themselves and others. Even if they are experienced, it seems like it would greatly decrease reaction time which could make a already occurred accident worse.
Some years ago, just east of Shawnee a guy on a bike passed me doing a wheelie. I was doing hiway speed (65-75mph) so he must have been really moving. Kinda scared me he went by so fast, then dropped it down and just kept on going. Wearing a wife beater, shorts and no helmet. Kind of disgusting. Oh well, gotta thin out the gene pool somehow.