The 2nd amendment as a political right is just of no use in the face of a modern army.

Wrong. It's an individual, inherent right that is the only defense you have against a government's forces, whether a modern army or rock throwing monkey soldiers.

How exactly is being disarmed preferrable to being armed while defending yourself from, well, anyone? The odds of success may be long at any rate, but they're far longer if you're utterly helpless. As such your argument is hardly persuasive.