I agree that paleo living is the best guideline to what our bodies need. But it is conceivable that some aspects of modern life have equalled or improved over the paleo. I wouldn't necessarily rule something out because it's not strictly paleo.
I usually put it in a little different way but say essentially the same thing. We have to live and function in the modern world and this requires compromises. Though there are no Woolly Mammoths or Saber Toothed Tigers, we can still do our best to adhere to the basic principals that got our species to where it is today. The best evidence we have is that our paleo ancestors were top level carnivores and ate a diet predominantly of meat. Whether there were any significant plant materials in the diet we will really never know for sure. What little evidence is available seems to point to a very minor role of fruits and vegetables, and these would have been highly seasonal - especially in the northern and southern latitudes outside of the tropics. Evidence also seems to suggest that we come from the African Savanna which is an immense grassland area with little in the way of fruits and other edible plants, but teeming with large grass eating animals.
Based on this, I've set my own personal dietary guidelines such that I try to make the best choice possible in any situation. I first choose any kind of meat over fruits and vegetables, but if starving would eat whatever is available. I then will choose red meat over pork, pork over fowl, and fowl over fish (in that order). Next, raw is preferable to cooked, rare is preferable to medium, medium is preferable to well done. Finally, I want the animal who's meat I'm consuming to have eaten it's natural diet - usually grass - but will eat grain fed if that is all that is available.
Following the above guidelines I've seldom found a situation where I couldn't make do. If the choices are really poor, I just eat as little as possible, often to be polite, and then eat my normal food when I get home. When attending a party situation, I usually eat just before I go, and then it is easy to not eat the junk as I'm not hungry.
I spend zero time trying to come up with convoluted ways that our early ancestors could have been able to create a modern 'processed' food requiring a good bit of technology when there is no evidence of the necessary technology existing at the time. Especially when there would seemingly have been no need for the processed food in the first place. Processing olives to extract the oil or even make them edible is an order of magnitude removed from hunting animals and/or the simple gathering of edible fruits.
Lex