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True, our modern societies where most people meet strangers often are historically unusual. Before industrialization the vast majority of population lived their lives in small village communities where everybody knew each other. Traits that might be harmful today weren't necessarily so back then.

I'm sure Europeans would have adopted any advances of great value to them, just like they adopted a lot of crops from the new world.

Try buying Greek if you can find that. At least the Greek brands of extra virgin olive oil I've bought in Northern Europe look and taste just like the locally product I've enjoyed in Crete. Italian and non-EU brands on the other hand taste totally different - and I don't think it's because of geography.

Definitely the Chinese, simply because their foreign policy is much less violent than that of the US, and they don't try to forcefully export their political and economic system to other countries.

Yep, for example salmon and other fatty fish is widely recognized to be highly healthy food from cardiovascular point of view, and definitely doesn't increase cancer risk.

I don't think even red meat is necessarily so bad - rather it's the fact people in wealthy countries eat way too much of it compared to what humans have done most of our species history.