The “Croydon cat killer” mentioned in this article is a terrible cat murderer working up and down England. City after city. He’s really cruel - battering cats to death in public places, then waiting, at the location, until the blood had congealed and then cutting bits off and leaving the remains there. Recently a biologist looked at the remains and said, “The fucking cats were hit by cars and then scavenged by foxes. We went through this exact same panic some decades back, don’t you remember?” Fox bites are consistently being misinterpreted as knife wounds. Apparently, given it’s still being reported as a human killer, not everyone has accepted that assessment, even though it perfectly fits all the evidence and a human killer does not.
This case sounds like it really is a human responsible, for some of the incidents, at least. But the sloppy, ignorant forensics generally done on animals means that some of the evidence of human action is no such thing, so the killer (or killers) might not be as prolific as they’re believed to be.