Could it be the over-powering stench of the wastewater treatment plant when I open the car door? Doubt it. What about the possible human remains found on the river bottom? Uh, not so sure about that either... The barbed wire fences, or giant dead bloated rats floating in the water? Nope. Could it be the thousands of pounds of trash lodged in the trees or effluent streaming by my bare legs? I really don't think so.
Perhaps it's the fact that I can go anywhere in America and have a legitimate shot at a 30 lb fish all for the cost of a gallon of gas and a bottle of water. That's why I love trash fish on the fly.