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Hacktivist deletes white supremacist websites live on stage during hacker conference
(techcrunch.com)
This is a most excellent place for technology news and articles.
First of all, it's NY State, not NYC, and Article 35.10 of the Penal Code says you are allowed to use physical force for self-defense or in the defense of others, but the very next clause is 35.15 which says that you have a duty to retreat unless there is immediate danger.
In a NY court of law you could argue that you were acting in the defense of others, but you would not be able to prove that there was imminent danger.