Yes, I'm willing to concede that there are plenty of assholes to be found in every nation.
It could be that guns are the only difference in homicide rates between UK and US. I'm not willing to stake anything on my theory that the US is worse off. However, we just had half the nation vote for Trump and they are willing to destroy our democracy in order to get him back. The worst you had was Boris.
Whatever it is, toxic masculinity or poor education system or white fragility. I think there is something in the mix that leads to gun violence in the US that you don't have in the same abundance. Maybe its the guns that make people crazy? Anybody who owns one is thinking about killing somebody. So maybe it's the mental conditioning that guns cause an owner to go through. All I know is, you have to be an asshole to draw a gun and shoot somebody just because they scared you or made you mad.