Couple things wrong with this. (1) Grammatical--delete [can't]. "Unless" means "if not". You have inadvertantly negated the protasis.
(2) The 2ndA is a paper instrument. It's force rests upon arms and the willingness of the people to use them to preserve a free state.
Paper instruments are preferable, if they work. But the ultimate responsibility rests with armed Americans who value freedom, even if they are a political minority.
However, although I agree with part(2) of your post, I believe that an armed revolt against a current or future tyrannical US government would probably consist of little more than an ineptly led mob of lightly armed and mostly untrained civilians that would have very little, if any, chance of successfully engaging well trained and well armed professional soldiers in what I believe would be the highly unlikely event that an armed citizenry would actually turn out en masse to defend their 2nd Amendment rights at risk of life or limb in the course of an engagement with US armed forces.
I just hope and fervently pray that all future US governments will honor our Constitutionally protected right to keep and bear arms, as well as all of our other God given rights. But sad to say, our current president's very obvious desire to join the European nations' rush to put even more and more dictatorial, authoritarian Marxist theory into practice in their economies and governments doesn't allow me much hope for a favorable outcome in the never ending battle to keep our Constitutionally guaranteed rights intact both for ourselves, and IMHO even more importantly, for our progeny.
BTW, thanks for correcting the mistakes I made in my mad rush to hurry up and finish my first post without inviting even more inexcusable verbal abuse from the light of my life who I swept away from her childhood hearth and home and into the joys of matrimony with my charming personality and extraordinarily good looks almost 53 years ago. Unfortunately, I won't be able to use the same lame excuse that I used to explain away the mistakes I made in my first post to explain away any that I may have made in this post. This could turn into a never ending series of posts correcting mistakes in previous posts, so I will end that process right here and now no matter what or how many mistakes I may have made in this post.