Solution: yes many man hours to complete, but ignoring the problem will only make the likelihood that they hurt someone become more of a reality.
Surveil these guys, one at a time... they have to stop someplace for the night.
When you know where they live bring in the tow trucks and warrants.
1.)Impound the bikes, and find out who they really belong to and send the bikes back to their true owners if stolen.
2.)Make the illegal riding fees , and impound fees like they do for street racing.
Bikes in jail for a year! try paying that impound fee, court costs ect.
Most will forfeit their bikes.
It has to hurt to work.
Whammy has no sympathy for lawbreaking like this.
If any of you do this you know what the consequences would be so reality is a beotch.