Because too many of them (and even one is too many) are violent thugs who want to use them.
The police are there to protect us, not advocate our murder; to enforce the law, not ignore Parliament's ban on the death penalty and impose a sentence of arbitrary execution. While it is a risky job, and force may sometimes need to be used, no-one should advocate its use, let alone be eager for it. Those are American attitudes, not kiwi ones. The sort of redneck thuggery and contempt for human life on display here has no place in our police force, and if our officers want to behave like that, I suggest they move to the US and join the LA or NYPDs. Their thuggish brutality would fit right in there.
