Gofor....I think you did the right thing. Sometimes the right thing and the legal thing don't equate. AS for carrying a gun.... while fishing...each to their own. Unless I'm fishing some zipperlip in the hilltop, I'm not generally packing. I'm a pretty big guy and still don't get into much trouble with folks because I'm not a bully.
Think about it this way....if you use it to defend your life or another's....it's probably justified...If you start a confrontation with some violator and it turns violent and you shoot and kill him, can you live with that?

I don't think I could ever feel good about fishing again if I had to kill someone over the breaking of the rules.