Or it will drive their pay way up to attract people willing to take that risk.
Our military isn't subject to many of the same international laws as other militaries for this very reason.
Personally I'd like to have it where if a cop commits a criminal offense he gets at least twice the maximum sentence. My reasoning is it's often harder to convict a cop so they need a bigger deterrent to committing crimes.
I'd think that if a cop followed the law and department policy he'd be personally exempt from liability. I'd even add some leeway so that mistakes and snap misjudgments don't remove that exemption. However, I am for personal liability for willful violation of a person's civil rights. This is a good example, since the cop had no reason under law or policy to perform an arrest, and it wasn't a stressful situation calling for a snap judgment.