Some say that traveling educates, meantime people coming back from a travel to US immediately turn into "I want big-ass loud intimidating pickup occupying two parking spaces!"
Americans might not all need big cars (or at least one car of the household could probably be a compact), but it is not obscenity that Americans/Canadians have bigger cars.
Around where I am, the Kia Telluride is much more popular than the Carnival, which I think is telling.