If you look at the primary reasons for the 2nd Amendment, stated by the founders and writers of the Constitution, that statement is exactly correct.
The 2nd is NOT about duck hunting.
Should German citizens have risen up and overthrown Hitler, when he disarmed the population?
EVERY genocide this world has seen has followed the forced disarming of the general population. Our founders had seen exactly that type of thing before, and were determined that it would not happen here.