Of course they did. They had 9 year olds carrying guns.Jefferson could never have imagined the firepower we have available. Flintlock rifles, that was what the second Amendment was about. Maybe the Constitution needs to change and progress with the times. Now we get kids shooting up schools, and the road rage assholes, workplace shootings, things like that. I doubt The founding fathers had any of that in mind.
John Adams said that the Constitution was written only for a moral and religious people. It is wholly inadequate for the governance of any other.
They gave us a right. It was up to us to use that right with wisdom. We didn't.