No, government is the greatest threat to liberty. If the guy in charge of prosecuting feels the need to not just not prosecute, but actively protect someone from the state, then we really really don’t want (who? his unelected subordinates?) prosecuting people. It’s supposed to be an “err on the side of” failing to prosecute criminals. The whole point is yes… sometimes we want criminals to get away with crime, because it’s better than the alternatives.

What is the alternative? One of them is the public vote for a leader, the state destroys that leader (or his allies, etc) and then what? Do we think the public just says “Oh, well, I guess we didn’t pick the right guy?”