Indeed, these are the REAL and most important reasons - but unfortunately the reasons least likely to be used in an argument in favor of gun rights. People more readily accept the idea of defending themselves against a common criminal .
But most people just do not want to face the reality that government is historically the most threatening criminal gang of all. They want to believe that government is their friend, because the idea they might have to be responsible for their own lives scares the crap out of them. This critical error has cost hundreds of millions of people their lives in the last century when their own governments disarmed and murdered them.
We better start talking about this historically proven threat, because if our only justification for owning a 30 round magazine is to fend off a home intruder, we are going to lose the argument.
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