In reply to Rob Exile Ward:
> The point was that the founding fathers wanted to avoid the government having a monopoly of force, or having a standing army, which they could then use to oppress the citizenry. The point about the 'well armed militia' was that they would provide adequate protection against external threats without handing undue power to central government.
I suspect that even that isn't the real reason. From debates at the time, note that it was the Southern states that asked for this amendment. What did they actually want a militia for? It was for keeping down the slaves. It was routine in the Southern states for whites to form an armed militia, which would patrol and look for runaway slaves, and generally form a "presence" that would keep the blacks subdued.
They were worried that the Federal government would be dominated by the Northern states, less sympathetic to slavery, and for *that* reason they were worried that the federal government might try to have a monopoly on armed forces. Without all the Southern whites having guns there would be little to stop the slaves rising up. Hence the 2nd Amendment.