I understand where the asker is going with this: would I rather punish the arsonist by saving him/her and getting him/her convicted, or would I rather let the arsonist die so I could get some possessions out of my house.
Well, guess what? All I have to do is kick out the window screens and my cats are GONE, so they're safe. That leaves me with the arsonist. Well, fuck you, Mr(s) Arsonist, because I am locking you in my bathroom, and the lock sticks because I broke it. Have fun burning to death!