You're delusional when faced with facts. What, you gonna tell me these big ass trucks and SUVs arent awful for the environment, or that pedestrian deaths arent skyrocketing?
Some form of "_____ are just by and large awful people" is an extremely common but rationally indefensible belief. The probability of man-made borders and categories accidentally separating the good from the bad by coincidence is effectively zero.
American attitudes are the result of incentives. Getting people to believe things can be very profitable, and American companies spend many billions of dollars getting Americans to believe that a bigger vehicle is a necessity with a wide ranging campaign that includes both traditional ads and product placement in music and movies. The same would happen anywhere else where a sufficient opportunity to profit exists.