I too avoid shooting with the general public. Not only are so many others out there slobs, but they are also dangerous. I'm lucky to have a pretty elaborate and safe range setup on my son's 80 acres. Still have to cleanup after myself tho. Still have to clean-up after those neighboring slobs that know when we're not there and they come over to shoot and leave their trash behind. Caught a few on trail cams we have set out and even when confronted with the evidence, they deny being there and attempt to make us the "jerks". These are the same folks that at the same time, whine about the local DNR land now being closed to recreational target shooting. Seems to be the norm anymore.
As with anything in life, if you are not part of the solution, you are part of the problem. Folks are to eager to whine, but are not prone to doing anything about it. If you hunt public land for free, fell obligated to pickup the trash you find instead of just whining. While I don't shoot there anymore, I am still a member of the local sportsman club and spent yesterday helping with their "spring cleanup day". Replacing/repairing gunshot damaged equipment/backstops and picking up garbage, not only on the club grounds, but in the neighboring woods that belongs to someone else. After being a member there for almost half a century, I feel I need to give something back. Does that slob that brought his household garbage out and left it for the critters to tear apart in the parking lot appreciate us picking it up? I doubt it, he just expects it. Still, members like clean grounds that they can be proud of. For most of us, so goes for public land hunting grounds and free ranges. We like to see them clean and get upset when we see them trashed. Seems once the trash starts, it just seems to multiply. Keep it clean and it tends not to accumulate as fast. Reporting vandalism to the appropriate authorities may seem like a pain, but it does help keep them informed as to when and where things happen and thus may prevent it in the future.
Are we ever gonna eliminate all the slobs out there? Nope, but by being positive role models to young shooters and hunters and teaching them proper ethics and manners goes a lot farther than whining. Setting an example to those around us and our peers can and does influence them. If those of us wanting to be the solution do our part, the problem, while not going away will be much less.