Largely because the left is less interested in hating and killing everyone around them over irrelevant differences. There are many armed leftists, they just don’t cosplay government overthrow or post apocalyptic warlord on a regular basis.
Have you gone to your local shooting range? I guarantee you it's populated by all right wing gun people. If there ever will be a social disruption and it's one side pitted against another, the blue team will not only be out gunned by overwhelming numbers of red team gun nuts but even the most morbidly obese right wing pieces of shit practice their marksmanship.
I wish we could hold meta accountable for this shit. Only if the Right were to deliberately target would they ever bother to lift a finger. Fucking assholes.
Pfft, Meta is actively trying to polish their shoes to not piss off the Right, to the point that they hired a right wing guy to advice them on how to handle themselves so that they don't break any eggsshells among the snowflake Republicans. They go so out of their way that the Zuck has lunch meetings with right wingers just to appease them, and has publicity admitted to giving them preference when moderating content.