Have you a concrete idea how what private services you would use to prevent animal cruelty?
If you have to ask this, you're not getting the point of "personal responsibility". YOU are the private service that prevents animal cruelty. Any questions?
So you would like the enforcement of animal cruelty rules handled by a vigilante service?
The problem with vigilante services is that they often result in people being killed under dubious circumstances. We had a man beaten to death for paedophilia here in the UK recently who it turned out was just unpopular with his neighbours.
Your idea would mean that if I think someone is being cruel to an animal, I get a weapon, force entry to his home and then make a decision as to what punishment is appropriate. Since I would have him at the end of a gun, you can see the potential for problems.
I can't see that as being more convenient than calling the police.
