I don`t know if the cat was cut, predeath or postdeath, the news report said that is so far unclear.
I don`t know if it was some "misguided" kid or an adult or several kids or adults.
The fact is someone cut a pet cat and left it in a school ground, psychologist would have a field day with that!
A psychologist, unless he was an idiot who looked much too far into things, would say that there could be any number of reasons that the person who did this did so. He'd probably realise that the most likely explanation is that a teenage boy did it in front of one or more friends in order to show off and prove how tough he was, or he was dared into it, quite probably with alcohol or perhaps another drug involved, and most likely when away from his peer group the kid felt terrible, but would never admit it to his friends. There are many other possible explanations, perhaps he was a serial rapist who decided to start torturing people and wanted to practise on a kitten, and of course, that sort of idea would get more attention than the most likely story.
I note that you're not big enough to apologise after being unfairly, nastily and wrongly accusatory. Oh well.
It's tragic that people do this sort of thing, whatever their reason, but the reality is that it happens quite often and is seldom reported. If everyone who did this went on to do it to people there would be no one left. I recently discussed this topic (animal cruelty leading to human cruelty) at some length with a friend who is a self-professed authority on psychology, she sent me quite a lot of data including studies published in science journals, which actually showed quite the opposite of what she was saying.
The world has some really serious problems in it, and I don't want to belittle or make light of them, but we don't need to depress ourselves and exaggerate the problems either. Have some faith in human beings and think about the possibility that maybe it isn't worst case scenario, it might actually be most likely scenario! Yes, that's still bad, I know, but we don't need to make it seem worse and stew and fear about some fictional demon wandering around.
Teenagers do things like this as an act of rebellion (yes, there are other reasons too, such as sadism, I realise that) and the more public fuss we put into this sort of thing the more teenagers who will be doing it as an act of social rebellion. The more we say "Oooh, I hope they get caught and dealt with severely", the more satisfaction they'll get out of doing it and getting away with it, which, let's face it, they're almost assured of, and they know it. If such a person actually was one of the few really scarey, really bad ones, gaining feelings of power etc from torturing animals, and was actually caught and dealt with severely, how do you think they would get their revenge and make themselves feel better? That's right, they'd take it out on the next kittens they found, or if they were dealt with severely enough, they may actually be pushed to have the need for more, and they might get that by moving on to abusing people. Such a person would probably need psychological help they're unlikely to ever get, but realistically, people like that are extremely rare and it's silly to assume without reason that this is such a person.