$$The Texas State Penitentiary at Huntsville cannot function without the ability of the guards to act to suppress violence and maintain order. While unfortunate, the death of inmate Gervasio L$$pez at the hands of prison guards cannot lead to legal action on his behalf against the guards or else these officials will not be able to do their jobs in the future.$$ This statement is an expression of the legal principle of $\_\_\_\_\_\_.$