I am not gung-ho about the MASH type stuff... Blatant jackhole riding is going to piss off cagers and probably result in a lot of kids trying to imitate and end up hurt/dead.
If you don't think people should be freestyle riding and playing around on track bikes.... take a second and ask if you should be riding your track bike on the street
People are just riding and having fun, absolutely nothing wrong with that (IMO). Remember, BMX bikes weren't originally for tricks, or were, dirtbikes, ATVs, shoes (parkour), etc.
It is called progression and it is going to happen no matter what.