Those black masks aren’t bulletproof.
Some of the protesters seem to be wearing some type of body armor.
Best takedown is a long pole or baseball battle, aimed at the ankles, kneecaps, hamstring muscles or shoulders. A good shot in the nuts is a guaranteed winner too.
But it has got to be done after the lunatics attack so it will clearly be a case of self-defense. CCP personnel have their own means of defending themselves from attack.