What ben said..
As to airlines other than AF not protecting the locals...well many airlines, even the flag carriers these days, are a commercial operation, with share holders and need to turn a profit..if the airline board sees a benefit to being "diverse" it will do it.
Just one example which may or may not have happened: an airline sees it will have a commercial advantage by employing foreign language speakers because of the large number of connecting passengers it carries from diverse countries. It finds it's local "natives" are not generally multi lingual, it decides it hasn't got the time or resources to make all existing crew multi lingual, but it finds it can source foreign language speakers from abroad...what do you think that airline will do?