Defence.
I think it’s (perhaps understandably) difficult for some Americans to grasp how much more profound an impact someone like Donald Trump can have on the rest of the World than someone like Liz Truss in terms of fundamentals to people’s lives such as stability, peace and living standards.
It’s easy to laugh at someone like Liz Truss when it doesn’t impact on your ability, in a faraway land, to put food on the table or even sleep at night worrying about WW3 breaking out, and so it’s simply more straightforward to be dispassionate, or even frivolous about that, than someone who represents a real threat to the wellbeing (financial and mental) of people on another continent.