Right off the bat, you'll notice that per capita, the UK has higher crime statistics in just about every category except gun crime (which I'll get to in a bit). Its rather sad that a country nearly six times smaller than the US has a little over half as much crime.
Six times smaller... Hmmm... Population, yes? CIA Factbook[1] gives us "63,047,162 (July 2012 est.)" against "313,847,465 (July 2012 est.)", so I'd put that at around a fifth of the population. Which is virtually the same, I'll concede.
But what about land area. CIA Factbook helpfully says "slightly smaller than Oregon". Imagine what that does to our population density. Which means that all those people here who
aren't robbing/murdering/piraticising each other are all either pretty good at being standoffish and not involving ourselves with others' business (London) or very friendly and look out for each other (everywhere else, but especially The North).
All I'm saying is that it's going to be a whole lot more complicated. (And because CIAFactbook has changed and ruined its ease of use, I don't feel like trying to compare what
it says about our relative crime statistics, so no idea whether that's better or worse. Please feel free to tell me.)
Anyway, in a topical "armed conflict in the UK" example, reported on the news earlier... A grenade attack. (Two in quick succession apparently by the same suspects, in fact, resulting in one fatality.) Well, it's an interesting outlier to the statistics!
Fakeedit: The other, intervening, challenges to the Nationmaster site also apply, but I decided to go for something simple. And then got distracted by the aforementioned problems with my previously 'first benchmark' source-site.
[1] Urgh. They've changed the site... Looks horrible now. Used to be easy to dip into and compare, but can't be bothered to work out how to do it these days.