The gangs in the UK have guns. They predominantly use them against other armed gangs and armed security guards. It's extremely rare that bystanders get shot, and most of the time it's in crossfire. The last school shooting isn't in living memory for many in Britain. British pop culture often focuses on defusing situations if possible, then using tactical, precision force should that fail. Precisely the same focus used by the British police and, more often than not, the British armed forces.
America has three to four mass shootings A DAY, and school shootings are just another week. American pop culture focuses on slaughtering everyone in the vicinity, as do the US police and US armed forces.
This tells me everything I need to know about those who has the unhealthy relationship to violent solutions.
Don't waste my time on cutesy theories and soundbites. Either you can offer actual evidence for your position or you cannot. And it is obvious from your reliance on cutesy theories and soundbites that you cannot.
As for "advanced weapons", the US has blown up a primary school in Iran, blew up a hospital in Afghanistan, and a civilian air raid shelter in Iraq. These "advanced weapons" are proving useless in Ukraine, as the Russians figured out over a weekend how to jam the guidance systems. Advanced crap is still crap.
Against this, the British have used aircraft with far less advanced weapons to blow up specific floors in specific buildings - something way way outside the capacity of the US. The day your "advanced weapons" in the hands of imbeciles can match crude weapons in the hands of actual experts is the day you get to tell us about these "advanced weapons".