An armed populace is a far better deterrant against tyranny than an unarmed populace.
Bear in mind that each state has its very own combat force(s) called the National Guard. These states guards have F16s and M1A2s that could be called upon by all the states to counter any rouge generals aspirations of dictatorship. Couple this with an armed populace and all is fine.
Also, dont drop the ball on a free mans right to defend against criminal persons intent on theft, rape and murder.
Its a double edged sword and both slice equally well IMO.
"A well regulated militia, being neccessary to the security of a free state, the right of the people to keep and bear arms shall not be infringed"
So it is written, so it shall be..........learn it, love it, live it.