Don't want to worry you, but in the past I've done open topped vehicle patrols around Worksop behind a GP machine gun... No live ammunition, though.
There is a VERY big difference - simply because (despite my above comment) the UK is not awash with guns.
There was a huge fuss in the region where I live about ten years ago at how the murder rate had peaked at a (for us) simply enormous number - four. (Three died in one family due to a boyfriend going berserk with a machete.)
I just don't think you can compare that to the USA, particularly with our much higher population densities (there is 20% of the US population in a group of islands that would comfortably fit inside a corner of nearly any one of your states)?
It's a different mindset. We don't need them to defend ourselves, because very few other people have them..
But guns isn't what this thread was about, is it - and it's sooo predictable how threads here about guns go, people get so fiercely protective.
The key point is defeating the fear in your mind. And if the threat is really real (so often we seem to overblow things) - well, why don't you move? :D