They should autopsy the cats to find out the agent used to kill them, then set up game cameras focused on the area where the feral cats are. Let them catch this piece of sick excrement and then force whatever poison they used on the cats down their own throat, in mass quantities. Those poor kitties likely had a miserable death at the hands of a human, after they put their trust in humans for their food. To betray that precious trust and subject them to pain and death is unforgivable.
See post #16.