This will never happen en masse. Humans are tribal animals, and naturally form us-vs-them mentalities when under the slightest amount of stress.

In other words: treat your friends the same as strangers, or at least choose them completely randomly to avoid bias.

This strikes me as unrealistic.

I said nothing about friendship or lack thereof. I never said treat everyone like your friends. I said don't treat people differently because they come from a different community. Whether that's their race, religion, citizenship, income, what neighborhood they grew up in or whether or not they were born on one side of the river or the other.