At first I thought that "caveman" was supposed to be insulting but apparently not. I suppose it makes more sense if you've seen the SNL sketch... it seems a take on "I'm a simple person and I don't know much but I do know *this*."
Josh gives us this version of the Caveman:
Hey, all you elected politicians and media types and academics! I'm just an average guy. I wake up and I go to work and I have a family. I don't know much about Shi'ites, Sunnis, Wahhabis, Salafists, Imams, Mullahs, root causes, or the desire for democracy in the Muslim world or whatever. My mind can grasp these concepts just fine, the fact of the matter is I just don't care. I don't know much about all that stuff, but there is one thing I do know: when a bunch of "death-to-america" chanting yahoos want to destroy our culture, attack our cities, down our aircraft, and build nuclear weapons, then they are entitled to the business end of a B52.
The only thing I'd add is that there's not caring and then there's deciding that some things are a distraction from the heart of the matter.