3) What makes anyone think Obama can pull this off with no repercussions? What is there in Barack Obama's tenure in the White House that makes anyone think he's likely to handle this well? The fact that he didn't kill a drone program George W. Bush set up? Because he was too distracted playing cards with Reggie Love to screw up killing Osama Bin Laden? Bush essentially won Iraq and Obama screwed up pulling out of that country and has put a hard-earned victory at risk. He's also on track to snatch defeat from the jaws of victory in Afghanistan. His incompetence got Americans killed in Benghazi, Libya. In Egypt, Obama helped get rid of a relatively friendly dictator in favor of anti-American, pro-terrorist theocrats who lasted just over a year before they were thrown out of power by an Egyptian public that seems to hate Obama almost as much as the Muslim Brotherhood. Yet, we now think Obama is going to insert himself into a terrorist-heavy civil war in the Middle East without creating as many problems as he solves? That's like emptying a box of live spiders in a teenage girl's slumber party and not expecting any screaming.
4) It invites retaliation from Iran and Hezbollah. Many conservatives believe that if we have a choice between bombing Iran or letting it acquire nuclear weapons, we'd be better off to bomb Iran. However, that is supposed to be a last resort after every other measure has failed. Given that Iran and Hezbollah are actively supporting Bashar al-Assad, bombing him means actively opposing both of them in a war. Could they retaliate against us with terrorist attacks? That's certainly possible. Will they go after Israel to get at us? That's highly likely. Will Israel respond to those attacks? Yes, Israel will. Could this set off a larger regional war? Again, that's certainly possible. While Iran and Hezbollah have much more to fear from us than we do from them, you don't walk up and kick a bee hive just because President Prissy Pants has worked himself into a huff.
5) It's not in our national interest to bomb Syria. Costly though it may have been, it was in our national interest to overthrow the Taliban in Afghanistan over 9/11 and to target an aggressive enemy of America like Saddam Hussein in Iraq. That being said, had we known in advance how long our troops would be stuck in Iraq, it's highly doubtful that we would have ever invaded. On the other hand, what's the rationale for bombing the side that's fighting Al-Qaeda in Syria? Both sides hate America. Both sides cooperate with terrorists. If anything, since Al-Qaeda is determined to kill Americans and Assad is not, the current dictator in charge is probably the lesser of two evils. Moreover, encouraging other nations to join us in imposing harsh sanctions on Syria would be just as effective as bombing when it comes to discouraging the use of WMDs without being as provocative. So, what argument is left? Are we supposed to bomb Syria to avoid looking "weak?" Well, if people have that impression, they can ask Saddam Hussein, Osama Bin Laden, and Anwar al-Awlaki what they think about that if they're willing to search through the bowels of hell long enough to find them.