Situations like China effectively exterminating populations they don’t like are why gun rights are so important.
Order men to re-education camps and forcing their women to sleep in same bed as police/watchdogs gets a lot less appealing if the woman can shoot their government mandated rapist.
Yes, in the same way that nothing wrong happened during Cultural Revolution when armed factions of Red Guard fight with each other. Also, I'm not sure how you imagine small militia fighting with worlds biggest army.