The constitution is too old, so I bet that there are jurisdiction accumulated during the years to control the effects that first sentence of the text, else It would be super dangerous.What’s scary about it, exactly? Do you think the state should have the monopoly on organising armed militias? What’s a Neighbourhood Watch if not an organised militia that exists for the purposes of protecting a neighbourhood? There are around 200 organised constitutional militias in the United States, it’s not exactly news.
Just think, citizen can literally set up a very powerful armed gang, and until it commits the first crime, the law can't do nothing about it.
Or else, a super rich guy or group can LEGALLY form a private army that can match, or even overpower State forces (that presumably are democratic forces)
How that would be fine?