Like in all neo-liberal countries, market regulation is considered the most evil thing on the planet.
That said, the prevalence of guns is just a small part of the issue. Its not difficult getting a gun in most countries. I could take the bus to Malmo right now and buy one, with ammo, for less than £200. Not sure if its the case in the UK but you could do the same thing in Netherlands, France etc. If you want to shoot people in a school, you can.
The main difference between the US and pretty much anywhere else is that people actually do these things over there. The issues are far more deeply rooted than just gun control.
Don't you have to obtain a licence etc, in Sweden and aren't they used for hunting, anyway? I'm sure you can't just walk around with a firearm in your pocket - besides, what's to hunt in Malmo?