Anonymizing photos of the violent ones is therefore likely to support their actions by making accountability less likely. To scrub ethically, limit it to the non-violent protestors. To support non-violence, better to help identify the violent people -- police or civilian -- the opposite of anonymizing them.
If they don't get convicted, will you be terrorizing only the jury, or do you plan on victimizing other innocent people too?
I sure hope you don't, but if you do get your wish please remember to have everyone print and sign their names on the petition/ransom note/demand letter. When choosing targets for arson just be aware it will take longer to comply if you burn down the courthouse(s).