The battles at Lexington and Concorde happened where they did specifically because the Redcoats were coming to seize the colonial's arms, so it's only natural the founding fathers would be sensitive to the issue of a government attempting to deprive the common citizen of arms.
And as Brother whelennut has pointed out, the expressed purpose of all ten amendments of the Bill of Rights (indeed, all 12 of the proposed amendments, two of which failed to be ratified) was to limit the power of government over its citizenry. Any contention that even the tiniest portion of any of the ten was intended to bestow further power upon the government is absolutely assinine. ASS-I-9.
When the NRA fought the Brady Bill, SCOTUS had not yet set a precedent as to whom 2A pertained to (regardless, 10A should have sufficed). DC V Heller corrected SCOTUS' previous oversight.
