All of this is true, but it’s also true that the President launched the attack without approval from Congress and no clear and present danger to the United States or our allies.
The precedent for going to war under these conditions was set by the previous Administration, but that doesn’t mean that the current Administration should necessarily follow it.
It was wrong for Obama to intervene in the Syrian Civil War without even so much as consulting Congress when Obama did it, and likewise Trump should seek approval from Congress if he’s going to continue it. If he can’t get approval from Congress, that should say something.
I do think the President can act without Congress in the face of clear, immediate threats, and Assad might be a butcher, but we ought to demand our elected leaders follow the law.
UPDATE: For the comments: how many of your lefty friends on social media are acting like Obama hasn’t been bombing targets in Syria for several years now?