This post isn't about starting violence with said guns. It is about the 2nd amendment essentially being a safety net against authoritarianism. There is a reason in the US we don't resemble current Canada, Australia, New Zealand, etc(not to say we are in the best shape either). It is because they know they can't get away with lording over us and doing whatever they damn well please because of the 2nd amendment.
Just want to be clear this isn't about starting violence or condoning it. It is about how important the 2nd amendment has been in keeping a large amount of our rights/freedoms in the US untouched.
We would have to use mass civil disobedience against potential tyranny. Protests, strikes, walk-outs... There's also other weapons you can use in guerilla warfare like home-made explosives etc... Guns can also be acquired with extra steps.