What is more crazy?
To believe tyranny is a threat or to believe that tyranny cannot rise? To believe that small arms are ineffective against the US Army or to believe that they are? Watch this debate between Ben Shapiro and Piers Morgan.
Anyone who ignores the lessons of history should not pretend to superior rationality. Benevolent governments have many times become tyrannies. Great armies have been harassed and forced to retreat by dedicated fighters with little in the way of sophisticated weaponry. Even the Roman legions were stopped by barbarians. The US military has been seriously harassed and weakened by far less sophisticated opponents many times throughout its history.
These two lessons – well understood by the founders – are why we should not remove small arms of any sort from the responsible citizen.