Canadians working and living in unstable areas

Every few months we hear about all the Canadians, many with dual citizenships, being trapped in unstable parts of the world as civil unrest raises up.  What obligation does Canada have to these Canadians that have chosen to live in these parts of the world, I understand that in many cases there are part time workers and tourists trapped, these  people should definately be rescued, but those that have left Canada to live in these countries, sorry but you're on your own. If you have been living outside Canada, not paying taxes, not contributing to Canada, you're on your own.  These people have made a choice, but when something happens they are yelling at anyone that will listen about how "we Canadians" need more to be done to rescue us from our new home in, Lybia, Iran. Iraq, Egypt, Lebenon, the countries list could go on. But what happens when these people get back to Canada, they hang out for a while and book tickets back as soon as the trouble settles down.  These people should just accept where they have chosen to live, and stop blaming Canada for letting them down, you don't live in Canada anymore.