If you have to go back to UK or Canada that is no big loss

    If, on the other hand you have to go back to China or India
    or AFrica then your entire family is #$@$#$%

Canada and the UK are nice places, but it's still a huge blow to have to pick up your family and move back to another country.

Source: I'm American, so I don't know this pain personally, but I was very close with a Canadian co-worker who was here on a work visa. He uprooted his wife and kids from Canada to come and work here. When our workplace soured, he had to do it all over again. Uproot his wife and children again, tell his children to say goodbye to their friends again, buy a house again, etc. Not easy!