May be everyone is having problem here.
May be everyone is away from there family.
May be they miss their husband/wife or children
May be they are not happy with job
May be they are not happy with salary here
May be they are not happy with living style (environment)
May be they want to leave this country but cannot due to exit
May be company not giving vacation or paying ticket
May be they have problem back in home...

And many more....