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As TFA says, you arrest them and give them due process, and hold the state accountable for any mistakes in the process.

Are you suggesting an 'eye for an eye' penal code? e. g. you would suggest punishing an arsonist by burning their house down?

(Of course not but I guess anything is ok when you disagree with the protest to begin with)

I'm suggesting the government of a country ought to be able to act in defense of its citizens before charging and convicting the perpetrators.

As I said in another comment, this is the expectation in other areas of law enforcement, so it makes sense to apply that here.