It's willful ignorance.

Truggers know damn very well that they are being disgustingly wasteful and greedy and destructive.

That by itself isn't that bad. But then they expect you to believe it isn't so, and they actually use and need their truck to do truck things.

If truggers were simply honest and admitted to everyone that they just wanted a big toy and they don't use it for what it was meant for, then it would be fine. Respectable even.

But they will never be honest.