It seems to me that many of these so called protesters don’t care about the law anyway. If they are going to turn up in their thousands in the midst of a global pandemic, set fire to Police vans etc, a law to say you can’t protest peacefully isn’t going to make the slightest difference.
1stly, I'm in total agreement with this assessment, but I am thinking here more about what lies behind the 'protesters' actions.
I suspect their actions were intentionally misdirected - namely to be directly against the Police, both officers and infrastrucure, whereas the causation (riot leaders might try to say 'justification' ) stems from valid democratic concerns and objections to the freedom of peaceful protest being restricted by a bill being put through Parliament. The Police, Crime, Courts and Sentencing Bill.
I have no evidence for my following suggestion, but these events are redolent of anti-social anarchists fomenting a riot firstly amongst the like-minded, and then encouraging otherwise well internationed protesters to join in.
a.k.a. rabble-rousing.
What makes me think this is likely is what we and they saw last year with the statue toppling in Bristol.
Throughout history people who have a pre-existing grievance can be manipulated to take misguided direct action by cynical exploitation by those activists who have ulterior motives.
Bristol had been seen to have a number of people who were prepared to take such action and I think may have been targeted as a 'resource' to be manipulated as a weapon of riot in this manner.
It's easy to say the correct route would have been to appeal to their (and our) politicians to stop or modify adequately the bill in Parliament, after careful scrutiny, and not to take the protest directly to the Police, (which have no say in the matter before Parliament) .
Unfortunately this is not how anarchists like to do things.
Attacking Police officers and stations - that's what they delight in.
They must be well pleased with themselves and the hornets nest they have managed to stir up. And as for their victims amongst the Police and cannon fodder followers, so much the better.
If this event hardens the political will, and results in the The Police, Crime, Courts and Sentencing Bill passing through Parliament unaltered, the anarchists win again as they will have stronger arguments for direct violent action because peaceful protest will be more difficult to organise.
Sorry for this long rant but I hate to see the perfectly justifiable action of the many being misguided and subverted by the underhanded and unjustifiable actions of the few.
Democracy is not the aim of the anarchist.
It is chaos from which they profit.