Running Mommy -
Maybe a talk from the local Sheriff's Department's finest to the group? Does MCSO have a community liason officer? I can't remember it's been a while since I lived there and worked with them (I played with the Lake Patrol crew). Maybe talk to them.

The bike club is not above the law. We've had one of the county Sheriff's Department out in force on our MS training rides - to strictly enforce the law both ways. They pull cars over for not respecting us, and pull bikes over for unsafe antics (blowing red lights, riding 4 abreast).

If anything happened to the riders, car/bike accident, I know they'd be howling loudly, but they have a responsibility to ride safely too. When it comes down to mass, they'll loose.