If all guns were to rapture and vanish from America , there would be less violence BUT  America has 300 million LEGAL guns in circulation, cities in chaos like Detroit, Baltimore, Chicago where dozens are shot every week. They share a very insecure border with a violent third world country AND they have a constitutional right to own guns, which almost 50% of Americans do. It cannot be compared to the UK or Australia. The starting point is very different. The UK, Australia, Japan.. they never had the gun violence rates that the USA did.  Canada is actually the exception in North and South America. Canada has gun violence levels more like those of Europe( except France due to terrorism)  or Australia. The USA should be compared to Mexico, Central America or South America.