One should remember that LE officials must follow the law as directed by the system of courts. One should also remember the court systems make all final determinations of guilt and innocence. Strange times when LE officials are called jack booted thug while I do remember the hippies calling the police other names of similarity.
I imagine they are VERY much like the rest of us humans when it comes to self preservation!
Sure; there'll be those who do 'heroic' measures when saving someone else's life; but I'd guess that most would be intent on savin g their own first!
"Better to be judged by 12 than be carried by 6" is also on THEIR minds!