This isn’t an error. It’s people claiming to have done a thing they did not do and demanding to be added to the count. To be clear, cops don’t stop violence either, most mass-shooters kill themselves in the end, but lone-gunmen are not out here protecting anybody. Guns only and always make confrontation deadlier than it has to be. There is no situation where having a gun makes you safer, whether you possess a license or not, and the statistics on mortality and gun ownership back that up, going back a long, long time.
Agitating for people to go fight the government with fucking handguns and long rifles is effectively carrying water for the people you hate. There are methods of resistance that are far less likely to get young people gunned down en masse, and by leveraging those methods first, the violence that eventually ensues can be reduced and contained as much as possible.