I wish to put emphasis on this part of your thoughts, due to personal experiences: "I think a lot of people that leave have high standards, refuse to compromis

I wish to put emphasis on this part of your thoughts, due to personal experiences: "I think a lot of people that leave have high standards, refuse to compromise them and also don't want to fight with people they care about. So they leave to live by a value of "live and let live."" Depending on ones temperament the phenomenon could be called chased away or traitor or something in between but whatever we call it it exists prominently in almost all society (well, all that I came across). I wouldn't go that far considering it the reason behind the pizza effect (plain old tourist visiting each other's country might as well generate pizza effect, or just a simple movie as we seen with Spectre), but definitely have influence on each other.