You might have a point except for the fact that the UK continues to lead the developed world in per-capita incidences of violent crime.
Scotland's murder rate is fastest-rising in Western Europe, UN finds - Telegraph
Scotland tops list of world's most violent countries - Times Online
Along with a rate of violent crime that has increased (with the rate of that increase accelerating yearly) drastically over the past 10 years (with ever stricter bans being announced and enforced; guns, pointy knives, dogs):
Murder rate increasing amid epidemic of knife and gun crime - Telegraph
http://rds.homeoffice.gov.uk/rds/pdfs04/rdsolr1804.pdf
Scotland’s murder rate soars - Times Online
...while at the same time, firearm sales in the US have experienced an unprecedented surge that lasted the better part of a year and US violent crime has -dropped- by considerable percentages according to the FBI. This in addition to the fact that the liberalization of concealed-carry laws in the US has accelerated over the past decade, and none of the "dodge city" horrowshows predicted by US and international anti-rights fearmongers like Sarah Brady or Josh Shugermann have ever materialized.
FBI: U.S. crime rates drop again - UPI.com
Crime rates down for third year, despite recession - Politics- msnbc.com
FBI — Crime Statistics - Press Room - Headline Archives 09-14-09
So: The UK, with increasingly stringent bans on weapons, has the fastest-growing rate of violent crime in western Europe, and is the most violent developed nation in the world. The US, with more guns in private hands than ever before, increasingly permissive carry laws, and even in the middle of a serious recession, is experiencing a decade-long across-the-board
decline in violent crime. This even despite the fact that the vast majority of weapons sold in the US during "the rush" have been Evil Black Assault Weapons And Hand Cannons Of Doom; the allegedly preferred weapons for criminals and terrorists! More people, carrying more guns, and a dropping crime rate for the US; fewer people carrying zero guns and an increasing crime rate for the UK.