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I would agree with most of your observations there. All accept that our initial transition into meat eating was "unnatural." Both adaptation and evolution are natural phenomenons. When environmental pressures become through abrupt climate change and associated habitat changes, the natural response is for animals to adapt. Recent findings have shown that bipedal apes were present in Africa for a very long time before there was a marked increase in brain size. Although the walked on two feet and shared many morphological characteristics with modern humans, their cognitive capacity was much more similar to what we see in chimpanzees. The transition from earlier hominid species into the homo genus corresponded to a time of massive climate upheaval in Africa. Essentially, what was once a large expanse of jungle and intermittent Savannah with a stable climate, began oscillating between extremes of aridity and humidity in very short spans of time. It was during this unstable period where our ancestors began making leaps in cognitive capacity, and those leaps correspond with archaeological evidence of fire use. There was jungle food available due to climactic conditions, which put tremendous pressure on the homids existing at that time, and they began looking toward other sources that would not have traditionally been primate food. The problem they ran into was that much of the potential sources had nutritional content that was "locked up." Without the ability of ruminates to unlock the nutrition in grasses, and the ability of carnivores to kill, eat and digest raw meat, there was really only one solution if hominids had any chance of surviving: fire. Fire serves as an external form of digestion, allowing us to unlock those previously unavailable nutrients. We would not have needed this if our original fruit-producing habitat had remained intact, but it didn't, and as any organism faced with severe environmental pressure would, we responded in kind. Naturally.