While I absolutely agree that the Hummer two-anchor world seems to attract more than our share of dorks ("Hogwarts"? (facepalm) for fuck's sake...wish I could say I don't believe it). But I don't think I agree that there's more assholes-per-capita in our community than the others. The RAG instructor pool probably gave you a skewed demographic. Just my $0.02.
From my experience, not even a-holes but just plain tools. Reason could be was I was a part of that world for 2.5 years. Some guys were great but as whole, it was just bad.