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Why?
Because, in the current environment, we require the Police to enforce the law / government guidance. That clearly requires them stopping loads of people doing things they don't want to be stopped doing. It can't be pleasant or rewarding work.
Having to do that while some dick with a mobile follows you around trying to make a few quid for themselves is frankly unnecessary. Just remember, he's not trying to protect your freedom, or your liberty, he's trying to make money.
... apparently he was right before, seeing as he won that case.
In general, I really struggle to see what your point is supposed to be:
Why?