Certainly, some riding yahoos throw beer cans down and leave trash at camp sites, but the "shooting" areas are disasters. Old TV's and propane bottles, etc. Not to mention casings by the thousands. Going out of town and targeting is a huge thing here, since all you really got to do is find a wash (public/state trust land). On a nice weekend, it sounds like a war has broken out.
I own guns, and occasionally go out and shoot myself, but I'm an adult. Momma don't got to pick up after me.
And the local ranchers/farmers...esp the older ones...they dump a lot of s*** too.
I guess what I'm saying is the OHV's are probably the least responsible for it in these parts, but we usually get blamed for it, as you said.