Most replies didn't get what I was referring to (but thanks for your opinions, at any rate).
Alfonso12345 wrote:
It all depends on why a person is aggressive or violent that determines if they are dangerous. Sometimes people are dangerous because of reasons they can't control, for instance disorders that cause them to be violent or dangerous. Sometimes even the most violent of criminals had no control over their actions, depending on what disorders they may or may not have had. If it is possible to treat the disorders that make criminals dangerous then they should be treated and then released but kept under observation for a while to make sure they are cured. If treatment is not possible, then there really isn't any point in keeping them alive because they would just take up jail space and they couldn't ever be released.
Yes, aggression is caused by something - but why not handle animals in the same manner? In all probability the cause is the owner, and they'll likely get more animals that become aggressive again. It's the hypocrisy and ultimate futility that annoys me.