I was thinking that vegetarians and paleo folk might not as far apart as it might look like on the face of it.
Simplifying, there are two types of vegetarians: those who do it for health reasons, and those who do it for moral reasons. It seems to me that the bridge between the health crowd and the paleo crowd might be inseparable – either meat is healthy, or it isnt.
However – for the moral crowd this looks slightly different. Let us assume we live in a world where all livestock is held under appropriate conditions. Of course this is not currently the case, but this is certainly the “grass-fed” ideal of the paleo folk. Now given that mankind dominates the globe it is fair to assume that there will be no herds of free-roaming animals that just exist – this period is over. All those “roaming” animals will have to live in a human-provided and human-controlled habitat. This comes at a cost, and this cost will only be met in scale if there is a tangible benefit for it.
So my conclusion: the choice is between animals having a good life, then being killed and eaten, or animals being denied a chance of ever been born in the first place. What is better? You decide for yourself…