Perception is subjective, and also it is hard to prove since it is in the mind: everything becomes permissible. That is why in law there is something called the "reasonable man test". Without that test, anyone can do anything and say that in their minds, it was completely logical to do so. To take it to the extreme, some people suffer from terrible paranoïa that makes them dangerous because they perceive everything as a threat, does that mean it is their right to act in consequence of those fears ? This would make for a completely broken society.
In a society where we are all equal, there needs to be an objective standard to establish what is or is not permitted.
In a society where we are all equal, there needs to be an objective standard to establish what is or is not permitted.