This is far from true. There are reports of incidents, but many people have been allowed to leave. The real problem with Syria is simply that it got caught in

This is far from true. There are reports of incidents, but many people have been allowed to leave. The real problem with Syria is simply that it got caught in the cross-fire of Russia's attempts to hold on to a semblance of it's prior global power and American Imperialism (call it the "Post-Cold War", if you like). Of course there is a third party, whom I won't name, subtly coaxing both of them on.