It's only "target rich" when you get to shoot at them, it's another story when bozos are doing things like entering a pattern any old way they choose, without bothering to make them pesky radio calls.
And lets not forget extending your downwind say about 3 miles away from the airport before turning base, just to see how bad they can screw up a traffic pattern.
And that is with fully qualified PPLs.
Lets also not forget about the fighter pilot wannabees zipping around in yellow homebuilts, Lord, they are scariest of all!
dago