"I need my guns to defend myself from the (((barbarian hordes)))" is exactly the kind of rhetoric that leads the rest of the planet treats gun nuts like the nuts they are. Unfortunately for the US, the US valorizes this particular psychosis
If you encounter a failing justice system and your response isn't "let's fix the causes" but instead "thankfully I believe in convenient self-service executions", you aren't upholding peaceable society, and I suspect that a peaceable society isn't what you'd prefer.
Consider too that there are many documented cases of the authorities being incompetent to or unwilling to stop a threat, most recently in Bondi Beach, but also in Uvalde. Maybe they’re just not coming to save you?