As Andrew said earlier, take a step back and think about this. Military intervention in Syria is a mistake right now, especially under these circumstances.
While everyone loves to hate/mock/insult George Bush, he was right about Iraq and the overall geopolitical threat (found WMD or not) Saddam Hussein posed. Osama bin Laden called the war in Iraq "the most important and serious issue today for the whole world," and his successor, Ayman al Zawahiri, said that victory there was essential if al-Qaida's dream of a caliphate was to be realized. Their comments suggest that Bush had genuine reason to believe that action in Iraq would help defeat al-Qaida even if Saddam had no ties to 9/11.
David Kay, who led the inspection team that determined that there were no WMD in Iraq, told Congress in 2004, "It was reasonable to conclude that Iraq posed an imminent threat. What we learned during the inspection made Iraq a more dangerous place, potentially, than, in fact, we thought it was before the war." Asked, "Knowing what you know now, would you still support going in?" Kay responded, "Absolutely."
Saddam Hussein was not just a genocidal monster but a sociopathic killer and megalomaniac who cared nothing for the lives of his subjects or anyone else. He also had design of regional domination. If Bush had backed down and allowed him to remain in power, he would have returned to WMD production as soon as the inspectors were gone, substantially destabilizing the Middle East and discrediting America's standing with every country in the region. Again, in David Kay's words, Iraq under Saddam was "More dangerous ... potentially than ... we thought ... before the war." If that potential danger had been allowed to materialize, today's criticism of Bush would be, "He should have had the courage to take out Saddam when he had the chance." For me, the half-million corpses in mass graves and geopolitical location settled the issues as to the necessity of regime change as does the simply fact that Iraq is no longer a threat to world peace.
The same can be said for Assad. The problem is we have a parallel to the first Gulf War (someplace I had some "intimate" involvement). In 1991 we spanked Saddam Hussein, we "degraded his military", we bombed his facilities and we left him in power. But this made Gulf II (a.k.a.) the Iraq War inevitable. But how did the massive military action affect Saddam's behavior? In 2002, a resolution sponsored by the European Union was adopted by the Commission for Human Rights, which stated that there had been no improvement in the human rights crisis in Iraq. The statement condemned President Saddam Hussein's government for its "systematic, widespread and extremely grave violations of human rights and international humanitarian law". The resolution demanded that Iraq immediately put an end to its "summary and arbitrary executions... and the use of rape as a political tool and all enforced and involuntary disappearances". After the war, southern Shiites and northern Kurds rebelled against Hussein's regime. In retaliation, Iraq brutally suppressed the uprising, killing thousands of Shiites in southern Iraq. As punishment for supporting the Shiite rebellion in 1991, Saddam Hussein's regime killed thousands of Marsh Arabs, bulldozed their villages, and systematically ruined their way of life. After the 2003 invasion my old unit found several torture centers in state security offices and police stations throughout Iraq. The equipment found at these centers typically included hooks for hanging people by the hands for beatings, devices for electric shock and other equipment often found in nations with harsh security services and other authoritarian nations.
So if the 1991 Gulf War didn't dissuade Saddam Hussein, why on earth do we think a "short duration limited number of strikes" will do anything to Assad? President Obama has argued such strikes are not intended to topple the Syrian regime. Then why do them, for what purpose? If Assad survives the action (and he will) it increases, not decreases the chance he will be emboldened to further use of chemical weapons as he knows he can do them with relative impunity. Further, he's had the time to relocate and hide his chemical stockpiles and delivery systems making their degradation even less likely.
Our President is a victim of his own "red line" rhetoric. Unless we are willing to go all in against the Syrian regime to topple it, and we're not, we need to tolerate the idiocy of UN rhetoric as an excuse to quietly back down.