There was this case in Norway some time ago, where two neightbours had been disagreeing for a time, about a barking dog one of them had. One day the one of them got enough, and killed the other's dog. When the other man noticed this, he ran over to the neightbour and killed him by a shot.
In the court this man did not recive any punishment / sentece, the judge or statement from the jury stated that the person could not be counted as rehaible in the moment of action, due to the loss of his dogs.
Just as a reminder.
Been a lot of ugly cases in Norway the last years about people abusing cats for entertainment, sadly police don't give a shit, even if you tell them who's the guilty is, even with pictures. In my hometown there was this gang that enjoyed killing small cars for the laught, one of the neightbours managed to get it on tape while they abused the one cat, police never did anything. I swear, if I see one of these idiots again, I'll put my finger in his eyes and hurts him/them, seriously.