I do think, though, that retaliating or otherwise won't make much difference to the overall situation
Our retaliation was intended not to help the overall situation, it was a global warning against the continued use chemical weapons.
Assad will win, the alternative is an ISIS in all but its name government, Assad will the brutally murder all those who didn't take arms to support him.
The situation is far more complex than bullishly saying why are we the world police and letting them brutally murder each other, the uprising was because they didn't want to live under a dictator, now ISIS etc are involved means the west are letting them play it out amongst themselves, and that unfortunately means being weary of immigration and funding camps in the ME .
Its a convoluted shit show, it needed to be done, but its a PR exercise that could be classed as willy waving etc but Russia/Syria will still have taken notice