In my perspective, do you think the Americans, British and French really care about the regime and that the [attack] yesterday was just to prevent the use of chemical weapons? It was part of it. But the main thing is, there was a hidden message to the Russians that despite your existence and massive victories on the ground, we remain part of the game and we will always be part of the political solution.
That is from Nawar Oliver and other view points can be read here.
I can think of two other reasons for the western military response to the Syrian use of chemical weapons. One is generous to Trump and has to do with the long term view of power. Chemical weapons like those used in Syria are arguably easy to produce. Most accounts I’ve read suggest a masters level of education with a few years of training is all that is needed. The fact that Syria, a country with a GDP of about 2,000, can make them is alarming to the powers that run the world. Chemical weapons are difficult to control and easily dispersed. They are a terrorist’s dream weapon and the west along with other major powers (Russia and China) cooperate and go to great lengths to ensure that they don’t spread. This explains the irrational position that the west will turn a blind eye to the killing of Syrian civilians resulting from conventional weapons but not the use of chemical weapons.
The other reason Trump was motivated was because of the emotional pull of seeing children gasping for air. The same thing happened when Trump ordered the first strike in 2017. Even someone like myself who is highly skeptical of military power solving political issues feels compelled to “act” in response to seeing children dead from being gassed.