I understand the impulse.
No, seeing a large number of people ranged in opposition will not deter them. If anything, it will make them feel their action is even more necessary “to stand against the Woke” or some such nonsense.
If you had a fervently held belief, would seeing an opposing crowd put you off?
Oppositional protests only make the policing harder and incite the thugs.
Seeing their pathetic numbers and getting arrested will be more use, I think.