Ok, so where did they get their info about violent crime in GB? Oh wait...never been there before huh? Also, of course it's going to have a LOWER incidence of violent crime compared to the US. GB(discounting AU) is a tiny speck of small islands none bigger than the state of Road Island.
That said, there appears to be far greater leniency with respect to the carrying, and use, of weapons by members of law enforcement in this country than is desirable. Interestingly, as you know, police officers in Great Britain don't carry guns, and that country has a much lower incidence of violent crime.