Lol - England where hurting someone's feelings can get you arrested. Don't have any interest in any Brit's opinions on anything - you all can be counted on to get it wrong.
Congratulations - you've regurgitated some favorite false talking points of the anti-2A crowd. The Founders, framers and ratifiers neither stated nor intended that firearms be possessed by members of a gov't militia and it's absurd to submit this in view of historical realities. Private firearm ownership was nearly universal in the 1770s.
As far as what those who wrote the Constitution could have envisioned or were aware of - meet the Puckle gun, the first semi-auto weapon invented in 1718.
Funny, I don't hear anyone talking about the ongoing mass shooting that is Chicago, Newark, Memphis, Detroit or any of the other inner city crapholes in the US where the vast majority of gun crime occurs. Or anyone talking about the thousands upon thousands of victims of illegal alien crime.