This is the action. It pushes back against fascist talking points in the public discourse and makes it harder for fascist to make themselves seem publicly accepted.
And you want to give the state the power to get rid of any group it deems undesirable? Or do you want to break the law to get rid of them yourself? This protest is the sign that the majority will not go along with fascist talking points, it makes clear that those talking points have no space in public discourse. This is how democracy is supposed to work.
I understand your longing for immediate action and I share the emotional need to cut off the snake's head sooner than later. Those who break the social contract of tolerance for each other should not be protected by it. Unfortunately it is a matter of fact that violence will always spiral out of control.
First you just want to get rid of the fascists. Assume you succeed and don't get reprimanded by law. Then you know how to get rid of someone and can act on it. What stops you to get to your rivals that want to strip you from your new found power? Chances are real you drift off into dictator mannerisms yourself.
The only way to not become what you try to eliminate is not to use excessive violence to begin with. Use the law. Use intimidating mass demonstrations. Use social pressure by making their views unspeakable again. Be better, stand for your values, organize with like minded folk and don't play into the stereotype of left groups always splittering into incapable small groups that cannot cooperate and coordinate
