Look at the French Revolution and the Russian Revolution. Also, the English Civil War, is another good example. Ordinary people, without much weapons or firepower, rose up against their governments. And suceeded.
Yes ordinary people can rise up and overthrow their governments, though as seen in the examples cited they don't need the right to bear arms to do it. So in a historical context the Second Amendment is not needed in order to protect against an abusive government. Perhaps that was the point that was trying to be made.