Hard to try to keep up but...
What I meant was that eating vegan diet is about 70% less destructive than a more mixed diet. That was the 70%. Going vegan doesn't make food magically have zero impact but I think 70% reduction is about right (A recent reference for carbon has .7 for vegan and 3.0 for keto but the unit escapes me). That would be the middle ground - going vegan is not 100% - only dying gets you there. So maybe not a middle ground but I was agreeing with you on one point - a classic technique.
It does so happen that 70% is also the number of overweight people in the US. And while excess protein is not the only or typical cause, it isn't like carbs/fat come from magic land. So the overconsumption is a very big problem. As someone who works with obesity, I can tell you that many also eat a lot of protein. It isn't all sugar (although mostly).
I don't subscribe to there being this huge genetic variety of how people are built and thus they need varying diets. I don't think you can find any science on that. There are various differences but they aren't very different that 100 years ago when a lot less meat was eaten.
You say that "vegan mentality is hypocritical" and say that is science based? I think you can find various scientific references for vegan diet and increased lifespan, less cardiovascular disease etc. The people that I know that are vegan do it for health reasons primarily. Doesn't hurt that they are all physicians.
To clarify, I am not a vegan. Since you seem to think vegans are yelling at you. I certainly think the overconsumption of meat is one of the sources of enviromental destruction that we have. It is also fairly easy to reduce compared to some other things.
We can't realistically and ethically reduce the population by 50% over the next decade or two. It is also a biologic imperative to have children. Doesn't mean it can be toned down but it is nature. Environmentalists all agree that population is a problem so saying that is the problem isn't all that helpful. There is no harder transition than the one for an aging demographic. Reducing the consumption of meat is a ton easier for a society.
It really is interesting how a lot of the same arguments for EV vs ICE fit together with dietary choices. All I can think of is a caveman ripping flesh off a bone sitting next to a fire grunting. He probably just forced a female to have sex with him also with his big club (which is sort of like a gun....)
Thank you for replying with facts.
-- I am not sure about the 70% less destructive number, and I have seen those carbon references as well, also I don't know the source/unit but I wouldn't contest that they are at least in the general vicinity of reality. Meat eating does require more energy to produce and is less efficient. They do not refer to "vegan' diets, but "vegetarian" diets, also typically include consumption of insect/fish protein. No issue there IMHO, but it would not qualify as Vegan.
-- I think we are on the same page with obesity. As you said, MOST individuals that fall in this category do consume protein.,.. however, their obesity is, in the majority of cases, caused by sugar/carbohydrate consumption. Just like with meat protein, good luck getting fat on vegies. It just isn't going to happen. Could you get fat on fruits? maybe, but you would have to work on it.
-- The science for "eating for your body type" is definitely where Keto and protein diets were decades ago. It needs to be fleshed out. That said, we do know, without question, that different people react to different macro nutrients. Ever heard someone say "I just can't build muscle" or "I can eat anything and not gain weight!" ? There are also the opposite. Is it gut biome? Maybe. Is it exercise/activity levels? Maybe (I put stock in this one). But to say there is one diet that will work for all is unlikely. I did do some digging for a scholarly article referencing a study on dietary requirements and I couldn't find anything that did an actual study (god the marketing and crap out there...) in order to prove or disprove physiology and it's impact on dietary requirements.
-- Hypocrisy and Veganism. I don't think you and I share the same definition here, and ensuring words mean the same thing to people ensures a productive discussion. Vegetarianism: Eats a primarily plant based diet. The purpose is to be healthy. Veganism: induce morality into vegetarianism, think PITA. We are now concerned about pain and our understanding of animal consciousness. When we cross the line between just being healthy to morality of animal consciousness we are beset by a catch 22. Do we kill the rat and starve the crow that wants to eat our crops? If so, how does that fit into our morality? Do we use pesticides to kill insects and do we care about their consciousness?
-- Yep, overconsumption (I called it gluttony) is bad. 100% agree with you and the OP on this one.
-- I am not sure what you are saying about ethical population reduction. The decline of the human population in the relative near future is a scientific thing. Here is a scholarly source, though there are MANY more:
https://www.austriaca.at/0xc1aa5576_0x003e1ec8.pdf
-- Correlation to ICE vs EV. Yes!! I agree here, but your analogy is funny and just so... wrong. Over simplification of pre-historic man and the assumption of cognitive simplicity is such an egocentric modern viewpoint... I digress, let's stay on point: what I am saying, in short is "We will stop eating meat due to technological advancement, and it's impact on the environment will be a non-issue". My interpretation of the OP and JRP3 is "we need government mandates and forced meat consumption reduction". I have seen, through multiple examples, such progress will naturally occur and is typically stifled and perverted by mandates. The best example of this NOT being the case is the dawn of electricity, railroads, and oil (past and present). The best examples of my hypothesis being correct is the current EV movement, GMO development, and computer progress.