Ok CRUCIAL facts:
Al Qaeda are in Syria because of Assad, not Reagan funded CIA (you are talking about the funding directed at anti-Soviet forces in the finnancial years 81-84!
). The Al Qaeda fighters (affiliated, not signed up, al Qaeda is not like the NAZI party with an official membership) are filling the vacuum created by instability in the country. They are a part of a broader action, comprised of local people, regional activists (Lebanese, Yemenis, North Africans et al) with widely divergent aims but inspired by similar catalysts. So, this is not a war in which one side is a government (by Western democratic standards) and the other an 'Islamist coalition' hellbent on sharia inspired holy war.
Next: Vietnam. Well how about Bosnia? American and European might ending brutal subjugation and modern genocide in Europe TWENTY years ago. In fact, in the maxim something must be done, 20 years ago when WE didn't, 7,000 men and boys were massacred in an hour in the small village of Srebrenica. The international community finally acted, (three years late) and that CIVIL war was ended. Human beings, people like us, were helped to live- to raise their kids and have hopes and ambitions- and a life to try and use to fulfil them.
It isn't our war? It is a civil war? Look what happened in Nam? This isn't 68, '72, nor is it the Cold War 80's or anything to do with Afghanistan. It is about a shared human history and a narrative whereby if my children, my wife, my friends were being suppressed, tortured and under threat of murder (by drowning in their own bodily fluids to mention one choice ending brought about by chemical weapons usage) I would want somebody, ANY BODY, to help. Being from those countries lucky enough to be the most powerful, the wealthiest, we i am afraid are those 'some bodies'.
To be clear, Churchill's aphorism that if you are 20 and conservative you have no heart and if you are 40 and liberal you have no brain is one I would in part concur with, but for good men to standby idly when crimes against humanity are being committed on people, humans, JUST LIKE YOU AND I, would be a disgrace and below the dignity of our nations.
IMO.