That is why we have elections, to sort these things out, and Trump is the man elected for the job.
He run on exactly opposite of what he is doing - explicit election promise to not get involved in more Middle East wars.
Now that he has better information at his disposal, I would hope that he would use that information as necessary.
This was done for one of the two reason - political move to signal coming home to establishment or foolish reaction to media hysteria.
Or it might have been done for foreign policy purposes, since it is in our national interest to deter the use of chemical weapons in the region.