You're reading "justice" here to be synonymous with government action. "Whatever means" = their "community" doing whatever it takes to achieve their goals, peri

You're reading "justice" here to be synonymous with government action. "Whatever means" = their "community" doing whatever it takes to achieve their goals, period. The author is essentially threatening murder, kidnapping, extortion, or worse and encouraging the members of the site to help make it happen.