I seem to remember reading somewhere that there's a hypothesis floating around that agriculture (of grains, at any rate) started as a way to ensure a steady supply of beer... Just throwing that out there.

GLC, I think some of the Paleo animosity is due to some of the more, uh, vocal Paleo people. They come off as either holier-than-thou religious fanatics, or dietary hipsters. (I think the same thing about pushy vegetarians/vegans. If someone tells me that I shouldn't eat meat, I have to resist the temptation to go buy a cheeseburger.)
I'm not entirely sure I buy the "wheat/legumes=poison" argument, either. Yes, there are people sensitive to them, but if you're not one of those people, I fail to see what the problem with eating them is. (And don't get me started on the guy claiming that gliadin acts as an opiate.)

(I may or may not be procrastinating right now...)