friend of ours is fedleo. He once said he’d never enforce illegal orders upon US citizens. My reply was that the orders would come under dire circumstances. What if the economy collapsed and there were no jobs? Either obey orders or you are fired and maybe prosecuted. How many, with good values now, would sell out, knowing they need to feed and house and clothe their family? His gaze turned away and he essentially had no reply. That is what will happen to many LEO minds should things go very badly. Self-preservation kicks in.
If your LEO friend shoots civilians so that he can feed his family, then your LEO friend would eventually be killed by the angry American civilians.
...and justifiably so.
It's a matter of values, principles and integrity versus becoming a thug who shoots a gun for a tyrant's silver coins.
You may want to consider making new friends.