You are comparing apples to oranges. Post-Iraq, I would have been upset if GWB wanted action against Syria. GWB sold me on WMD in Iraq. What we got was a bloody mess, no WMD, a huge backlash, and Obama in 2008. My threshold is now astronomically higher for mucking around in that Middle East hornets nest again.
But Obama's chemical weapons rationale is not some misguided venture to protect the U.S. from a threat; it is simply subterfuge for using the U.S. military to destabilize Assad and helping the Muslim Brotherhood/Al Queda come to power in Syria, the way he did in Egypt and Libya.
This is a responsible and fair answer. Thanks. Very logical.