This sounds like one big lie, sounds like you aren't looking for a cat sitter but victims. It's because you told Matt you only had 3 cats but actually had 4 and you know about what your cats do and didn't warn Matt that he would die if he didn't follow them. When you hire someone, and the job is dangerous then you need to warn them. Matt was a stupid typical male, but you let him die. That's on you.

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Edit: The fact that so many people are okay with Matt getting killed because he kicked a monster cat seriously need help.

Oh shit, looks like you didn't get the advice you needed soon enough. I feel sorry that you had to do all that just to destroy the cursed stuff. I mean it's either be on the run for the rest of your life or turn yourself in at this point. But you did as good as you could, you definitely saved other potential victims from those things.