I don’t have much to say; perhaps you do. The hell of it is (as several commentators have noted): it doesn’t seem like a distinctively Trumpish response – fire off missiles, let God sort ‘em out. That bit seems as American as apple pie, and President Clinton might well have done the same. The Trumpish part is: willingness to bear the expense of Tomahawks, plus the imponderable downside risks such action entail; plus unwillingness to accept any Syrian refugees – comparatively simple, easy, open, safe, hence morally logical as the latter course of action would seem to be.
The attitude that you can mix mandatory harm-infliction with humanitarianism is less baneful than the attitude that you must do only harm, by way of achieving good ends. But neither attitude is what I would call sane.
Do pundits take some hypocritic foreign policy oath before they are allowed to opine: first, do some harm? Literally no one thinks Trump has any plan for improving the situation in Syria. That would be crazy. Why would you be heartened to see someone blowing things up without any plan? Why would the sight of huge gouts of American hellfire ever seem like a heuristic indicator of increased human welfare?