The fact that it might make logical sense to you or I that they should is entirely irrelevant. We're not there, and if we were, I doubt we'd be much driven by logic at this point. Not to mention we wouldn't have had access to the internet or regular communications with anyone for months now, and only see the death and devastation.
It is not the same, but in a sense this odd naivety was a similar surprised reaction to US withdrawal and quick rollover of 'local' army in Afghanistan.
<< We're not there, and if we were, I doubt we'd be much driven by logic
I think this is worth highlighting. edit: The reason to avoid war is because it is horrific and can remove all sense from a man.