The enemy of my enemy is my friend. Not necessarily true, but often used to justify US foreign policy. Before and after WW2, Stalin’s Soviet Union was our enemy, but during the war we were allies against Hitler‘s Germany.When Iran and Iraq were at war, we were friends and suppliers to Saddam Hussein‘s Iraq. After that war concluded, we became Saddam’s enemy and then found it necessary to invade the country in 2003.By doing that, we nearly touched off a civil war in Iraq and it still may happen. We learned in Vietnam to stay out of civil wars, and now some in the US are advocating that we become involved in the Syrian civil war. BAD IDEA. We should let the Syrians sort it out. Just because some are opposed to Assad does not mean we should align ourselves with some or any of his opponents.