I am open-minded about guns. I think banning them outright went too far and had no measurable impact on crime (positive or negative), since it wasn't as if many people had them anyway - they were a rarity. I'm not just saying that, it is the honest truth.
It boils down to whether you see guns as some sort of obstacle to 'tyranny' as you put it or a hobby or a deterrent to crime. The latter two I can understand, the former is something based in the American culture which I will never share or understand. I think there are greater threats to the liberty of British people than the government going totalitarian. So far, history supports my viewpoint. Civil uprisings without the support of a significant part of the military have nearly always failed. The guys with the real guns wearing uniforms end up being the revolutionaries.
And Dago, we have a well trained armed forces that takes care of defence. We don't need civilians armed with 9mm pistols to add to it.