The problem they have is that they will act disproportionately on one occasion then try to manage it through PR and it backfires.
They've also been guilty of poor policing through covid and disproportionate action against calmer protests - where right wing media and politicians have applauded those actions and called for tougher policing.
Now, those same voices are silent because these are the people they're trying to entice and if the police do act as they should to violent protest, the likes of Braverman, Farage will be claiming that policing is 2 tiered and lead by liberals.
Coupled with massive cuts to policing and police budgets, we are where we are.