The Founders didn't want an armed citizenry. They wanted a select Militia. They ended up with a well regulated Militia.
The founders wanted an armed citizenry. Your failure to understand that explains your inconsistency in interpretation. Ask ultra-liberal lawyer Lawrence Tribe what the second amendment means. He will reluctantly tell you; an armed citizenry.
All wanted an armed citizenry, even Hamilton, the foremost proponent of a Select Militia. But some, like Gerry, most definitely did not want a select militia at all. It was to pacify them, the anti-federalists, that the guarantees of the Bill of Rights was formulated and passed. They also wanted a "well regulated" militia, one well suited to its tasks.