Ineffiency puts an upper bound on tyranny.

Regardless of whatever you think the police are "sworn" to do, we have incontrovertible experimental evidence that they often do not have our best interests at heart.

You know what also makes the jobs of police officers harder? Checks and balances. The right to a lawyer. Miranda rights. The fact that they have to get warrants.

It is hopelessly naïve to assume that anything good can come of giving the police more authority.