Using your thinking, we were justified into going to war with Afghanistan, Iraq, Libya.
Which is more evidence of a false flag. Syria wanted us out, so they would be on their best behavior. Using a commercial chemical against his own people would be political suicide. No motive. Look instead to those who want the USA in the region. Russia, Turkey, Syria… NO. SA, Israel, CIA, IMC, Zionists, Al Qaeda affiliates… YES