It collapsed because they could not win. It took new leadership to recognize that. Fifty years ago, we were doing drop and cover drills and since then the 24 hour flights loaded with nuclear weapons came to an end.

No one wanted to deal with Hitler and let him invade nearby countries. I dont see much difference here. You wont change much by allowing the people who want to leave and are able to leave, to come to the US and Canada and escape. It only delays the revolution in those countries that must take place. Those that come here, to assimulate Americans into the Muslim faiths, are doing so peacefully and we will regret it. .02