I noticed this problem on a recent trip to the S. Platte river in Colorado (where I grew up). I grew up baitfishing and then migrated to flyfishing when I got older. I was always taught to respect the river and its users/wildlife. I think most bait fishermen do as well.
The percentage of bad fly fishers and bad bait/spin fishermen is probably just about the same. I've seen some real pigs with swish outfits and goretex waders.

The problem is that there's a lot more baitfishermen than there are flyfishermen on most tailwater/stocked fisheries. So the effect of the baddies is more strongly felt.

I think the penalties for littering river banks should be more strictly enforced/steeper. And most DNR guys would agree - but they just don't have the manpower to do it. Its up to us to keep an eye on things.

Mike