Agree with the sentiment, but suspect asymmetric warfare principles will be more effective than defending against a 20 man SWAT team. Self forging directional munitions and RPGs accounted for about half the US casualties in Iraq and Afghanistan. Can’t do much about creating something that’s as complex as RPGs in your basement, but starting with sulfuric acid and a few other ingredients and following online formulas you could get to the anti armor and anti personnel devices - though to do so would be blatantly illegal and considerably more dangerous to your freedom than gun control at the moment. Though if confiscations start I would think that would be the tipping point.