I agree that this is a unreasonably high standard to hold people whose job doesn't have anything to do with being the sole arbiter of violence and defusing dangerous situations at the trust and expense of taxpayers and local citizens to.

If they don't want accountability as police officers, they can go find another job.

Edit: unless you meant not supervisors but the policymakers who define "punishable behaviour", in which case getting rid of body cams is about as helpful as rearranging the deck chairs on the Titanic.