"Vegans often cite the desire to not kill animals as part of feeding themselves. But it’s an incorrect assessment of reality. A vegan diet is obviously very high in plant matter. Everytime a field is plowed, disked, planted, fertilized, and harvested, machines run through the field. Machines that invariably kill countless small animals and destroy burrows and nests."
Well, I hate to be a stick-in-the-mud. However, I'm you do realize that the majority of meat is grain-fed? That means that even if you choose to eat meat, in most cases you will contribute to the same problem as mentioned above, you are not "absolved" from it so to speak. Grass-fed beef is not always available to people, either because of scarcity compared to grain-fed, or because of the higher costs. Some grass-fed comes with its own problems, too. For example, a lot of the brazilian rain forest has been cut down to make space for grass-feeding herds, among other reasons, of course.
I also have to take issue with the "trading processed for processed" argument you make. I don't have any statistics on this one, but on a personal level I can say for a fact that I eat very little processed foods and fake-meats. Does it happen on occasion? Of course, but the same might be said about the ethical omnivore who mainly eats grass-fed, naturally raised meat and locally grown produce. Every once in a while these people eat processed food, too. For myself, it actually comes down to when I have dinner with my family and they want to make something for me. They use fake meats, because they're not sure how to make vegetarian dishes otherwise. To me, it seems more like a thing of the western culture. We are used to eating meat, to prepare dishes that are centered on meat and we often grew up eating meat. Missing meat, or eating meat-like dishes might just be a result of growing up in such a culture. Yes, it can also be the result of missing some important nutrient, as cravings sometimes are, but I think it's important to consider both perspectives on this point.
I'm not a vegan myself (I'm a vegetarian), and I do find aspects of primal eating and the primal lifestyle interesting and enlightening. However, I didn't really find that this article hit its goal, if that was to help vegans/vegetarians to be "better" (more paleo I assume). Maybe it's hard to resist to elaborate on why one doesn't find a vegan/vegetarian lifestyle to be the best compared to a paleo lifestyle, but it's hard to gain followers that way (I know from experience that it's hard to gain vegetarian followers that way, at least! ;) ) I actually found this article searching for ways to make my vegetarian lifestyle more primal, but I didn't find a lot of concrete examples. Maybe that wasn't your goal and I have misunderstood you, but that was what I was hoping to find.
I really am interested in a more primal lifestyle, but it saddens me a bit to see parts of the community so hostile to it when it seems to me that both communities in a way are flipsides of the same coin. Primal eating is about cutting processed foods and go back to stone-age basics, to put it simply. It seems to me that the primal community often focuses on the meat-eating aspect while a vegan/vegetarian focuses on the vegetable-aspect. I'm fairly sure that it would be benefical for most primal eaters to know a few primal and vegetarian recipies for when grass-fed beef and organic, free-range eggs are not to be found, or those occasional lean months in the year when the budget is stretched a bit too thin for organic and grass-fed meat, or maybe just to enhance variety in your diet. Likewise, a lot of vegans and vegetarians might learn how to cut some processed food and lower their carb intake from primal eaters if they wanted to.
In conclusion if you really are interested in helping vegans/vegetarians to be better (more primal) in their lifestyle choices, I am sure that you could find some primal vegetarians out there who would be very interested to elaborate on this subject and guide other vegans/vegetarians towards a more primal lifestyle if they are interested.