system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Many countries have been ruled by worse regimes than British rule of colonial America. Why haven't they developed a right to bear arms to counter potential government tyranny?
gpt
I would go with: 

1. The American Colonies were able to successfully oust the British by force of arms. Arms were seen as necessary for securing your own liberties. 
1. The weapon a civilian was able to buy and that carried by a soldier was roughly equivalent. 
1. The US did not have have a standing army and was to rely on well regulated militia. 
1. Having just thrown off one tyrant you really, really, wanted to make sure you could throw off the next one in case your government went bad.