[MargaretR]

I don't want to disillusion you but-
it has been known for peaceful protests to be infiltrated by plain clothes police who then went on to disrupt the peace and act violently, in order to get 'arrested', thus smearing the 'good cause' campaigners.

This is evident on live stream videos I have watched.
...and was alleged to have happened during the miners strike

So....everything is not always what it seems