There were and are vegan and near-vegan indigenous cultures, and their old people are described as amazingly youthful and full of energy. And they probably have a lot more free time than you do. Their cultures are also virtually free of the diseases that plague meat-eaters and modern man in general.

In fact it takes huge resources (human, fuel, water, land) to produce meat compared with what it takes to produce vegetables. Were the world vegan, it would know a prosperity and health you cannot imagine, even without modern machines and technologies. Meat production is an ecological and health disaster, especially in modern form.

Your imagination that primitive peoples got most of their nutrition from hunting is just that - imagination. Hunting wild animals was a part of many cultures, but diets mostly consisted of vegetables, grains, and fruits, even among meat-eaters. If they had tried to survive by hunting they would have starved to death.

How dare you speak for other people, as if you know the choices they would make. Believe it or not, there are people in this world who choose to die rather than kill to survive, and have the control to do so. For your information, I have known hunger, to the point where my health was deteriorating. Not only did I not go kill an animal, I didn't even steal from the local grocery store. It's a thing called principle.

I don't pretend I know what I would do in every situation. In some, I might choose to eat fish or other animals to survive, but not because I imagined my life more important than theirs. More likely, I would not kill. I have that level of control, even if you cannot imagine it. In general I don't view killing as my way, whether it is killing animals justified by being hungry or killing humans justified by national fears.