The 2A people joined aligned themselves with the new government perpetuating the abuse. They’re against the parts of the constitution that include rights for people they disagree with. They aren’t interested in protecting anyone, their interests are in supporting the oppression.

Yeah, the 2nd Amendment was intended to prevent exactly this, but the authors of the constitution placed far too much faith in decent and intelligent people running the government. They never foresaw the intent of the rules being corrupted and those tasked with defending the constitution instead deciding to dismantle it.

E: removed “joined” to avoid semantic debate. It is a self reinforcing loop. The political sphere courted the extremes, the extremes voted in more fringe politicians, those politicians supported the extremists. White extremism is part of the government. White extremism and right wing politics in general exploits the Second Amendment to use it as implied threat of violence to perpetuate their extremism.