Read the comment from 'Social Critic' here [LINK].
A small extract:
...In a tiresomely predictable way the tautology repeats like this:
1. No one may ever question police behaviour because whatever the officer perceived is what the officer perceived.
2. Therefore whatever the officer did in response to the perception is reasonable.
3. Therefore the officer is always right.
4. Therefore anyone who disputes the officer must by definition be wrong. ...
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