"So obviously all that careful vetting of gun owners has no effect."
This crap annoys the living bejesus out of me because it's another sleight of hand and is dishonest, which is a huge part of the problem. Contemptible.
From here: How many people are killed by guns a year in Great Britain?
Last year there were 51 gun homicides in the UK.
The population is 62M about 1/5th that of the US.
So if the US had the same level of gun crime, that would give an annual death toll of 254.
You've got too many guns and that is why your country is killing innocents by the hundreds yearly.