Because people are safer with others of the same group around. People that come from other places have different cultures, rules, beliefs and behaviour therefore their actions cannot be predicted. So much time ago there was no crime because the group of people you had around was stable and life was safer. That is why you don't want strangers at home

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That sounds like a pretty collectivist and protectionist way of looking at it. Yes it is true that different places have different customs. However, by using generalizations on who might be consider outsiders, you effectively keep the status quo of customs intact instead of allowing new customs in that could potentially benefit certain places.

Collectivism has nothing to do with that. Yes keeping the status quo makes life easier. And yes it's a generalization. Generalization is a very useful tool that gives the ability to predict potential danger in similar situations without having to experiment again and again. For some reasons in these days the basic idea of being safe and protect ourselves is seen as bad. It's not.

Life today is hell because we forgot the old rules and we are experiencing again all the pain that we could have avoided and will reinstate at the end the old rules.