The sweet think about box a.k.a. live or Have-a-heart traps is that when you trap a problem cat it can be eliminated discretely and the PITA cat lover is none the wiser. Don't say squat to any one either before or after, just let the PITA cat lover imagine the worst. You may even get a two for one out of this by taking the cat collars and leaving them under a hawk's or eagle's nest. At the least the cat lover may keep their cats better confined. At the best the PITA cat lover may take it on himself to settle the score with the tabby eating raptor. Feral cats are the most destructive introduced animal on planet Earth and every year in just the USA they kill 10s of billions of birds and other small animals. I have a cat but he is confined to my house 24-7. What makes those PITA cat lovers so much better than you or I? In short they are no better if as good as anyone else.