I can't believe how much people get worked up about this kind of thing. I'm against cruelty to animals myself, but if it was simply a bird, which was about to ruin a months hard work of mine (and a good hundred other people), I wouldn't think twice about stopping it, in the quickest way.
It's the people that say they want, or are going to get revenge that really annoy me. Why don't you try taking a trip to Africa, and getting revenge on the poachers, deliberately killing endangered species, every day.
I can't imagine what these people would think, if they knew of every incident like this.