That is a very dangerous assumption.
Look at the issue of “Well-regulated.” Many writings of the time hold that term means “official, state sanctioned,” like what we would call the National Guard today.
Look also at the FP? Do they object to arms bearing by convicted felons, felons on the run, those we would today call terrorists, do they differentiate between concealed and openly carried?
Remember, every time you are in court, with what one thinks are his overly convincing arguments, the other side is there with the same belief.