Policemen are individuals, just like you and me. They have received only the power, from the State, that the constitution grants them -- which is none.

The constitution is a document, a contract if you will, supposedly binding on "We The People". But the people in question was never asked if they accepted this contract; they never signed or affirmed it. The only people the constitution has binding powers on, is those who have signed it individually -- who are all dead.

The policemen, granted powers to enforce the law by the constitution, which binds no one, perform only illegitimate actions over other's person or property. Thus, if anyone's person or property is being invaded by a policeman, he has the total right to defend himself and his property -- even lethally.