I saw a lot of crazy at the tournament this weekend. From boats on pad through stump fields to people trolling 10 yards away from me while I'm anchored with the trolling motor up. It sucks, and happens a lot. Personally I believe karma will get them in the end so I fume about it for a bit, make the occasional comment about rules and safety and hope they learn something. This is my 12th year at this tournament and it seems crazy is always present.
In your case fishing a public spot, I might have mentioned respecting ones distance and ask for space. Would it help? Eh prolly not, but that's when I hope karma kicks in. Ultimately if it's that popular of a spot, might be best to find a not so popular spot.