Well, most people on the planet don't eat meat in every single meal.

I've commented on this before, but I'm Greek and our traditional cuisine has many dishes that are naturally vegan, in the sense that no meat or animal products are used in them, but nobody actually calls them, or thinks of them as vegan, only as "normal food". There's a list here, compiled by a vegan very happy to have visited Greece:

https://www.thenomadicvegan.com/the-nomadic-vegans-guide-to-...

I believe this is a common situation in many parts of the world. I thik most people eat meat only according to their needs. Especially earlier in human history, before industrial farming, meat would have been an expensive luxury for most people, who would have complemented their diet with fish, dairy and eggs, being naturally lacto- ovo- pescaterian rather than vegan, and would have eaten meat (especially beef) on special occasions like feasts and weddings and so on.

So maybe veganism is a reaction to the particular eating habbits of specific parts of the world, where meat is eaten too frequently?