Everyone has enemies but might not know it yet because their enemies don't have the power to act on their malevolent desires.
Find common instances where people regularly abuse power: child abuse, terrible bosses, emotional abuse of a spouse. The most common denominator is that people hurt others because they can, and those who couldn't will claim that they choose not to.
What you're describing happens, but it's not rampant. Paranoia isn't lizard people, it's simply ascribing blame out of fear where it may not exist.