I think his opinion was indicative of the prevailing opinion on the need for guns, true. However, it is hard to imagine what any historical figure would think today. After all, we are not talking about stripping all people of all firearms. It may be one day the Second Amendment might be struck down, though that would take much more than a majority. Here, we are only talking about background checks in order to better define what Adams would have called “peaceable citizens”.
I came across this resolution from the period that directly involves free speech and right to bear arms.
“That if any person or persons shall hereafter oppose or deny the authority of the Continental or of this Congress, or the Committee of Safety, or the Committees of the respective Counties, Cities, Towns, Manors, Precincts, or Districts, in this Colony, or dissuade any person or persons from obeying the recommendations of the Continental or this Congress, or the Committee of Safety, or the Committees aforesaid, and be thereof convicted, before the Committee of the County, or any thirteen or more of their number, who shall or may meet upon a general call of the Chairman of such Committee, where such person or persons may reside, that such Committee shall cause such offenders to be disarmed”
amarch.lib.niu.edu/islandora/object/niu-amarch%3A87788