how can they be stopped?
Just about.
There is a full fledged club about 15 minutes from my apartment, but I drive about 45 minutes one way because it is really nice to be with a lot of guys who just want to fly.
There are always people who think no danger is acceptable. There are those who feel more comfortable with posted rules, regulations, and methods to enforce them. There are those who enjoy arranging and organizing.
There are also those who can handle problems among themselves without a set apparatus for it. We are just some buddies who fly together instead of fishing.
We don't need no stinking rules!
Beergator