I'm from the UK. I've heard many of the arguments on both sides, but to me nothing is more convincing than the statistics (example: http://www.bbc.co.uk/news/world-us-canada-34996604). I'm also a libertarian, I fully understand that if anything a right to bear arms is needed because any other way is a breach of personal liberty. However, I can't help but see that as a negative side effect of full liberty, because inevitably it just leads to more people getting hurt. That's the numbers talking.
Yes, cars also kill people, but I don't need a gun to get to work. The benefits of having cars in society vastly outweight the drawbacks. With guns, the only benefits arise when a really tough intruder is in my house or when the government is trying to oppress me. In the UK we still manage to survive a break in without shooting everything in sight, and if the government came after us, they'd likely win even if we had a gun.