He's still illegitimate and senile, so I doubt he had much say in the decision, but it's definitely a good thing that he's not letting the Iranian terrorists get away with attacking our people. If that starts a war (it won't) then so be it.
For your situational awareness, this was an attack on Iranians, no Syrians. They're kinda allies, but the Iranians definitely take liberties in Syria and the Syrians have no power to stop them. Russia wants to maintain some presence in the region, which is the only reason they care, and you can be sure they're advising Assad to not react. They certainly don't want to go to war with us over Syria. Their forces in that country are extremely vulnerable to us, never mind the fact that it would probably spiral out of control. Russia's military is a joke, despite their best efforts at producing propaganda to the contrary. They know strikes against Iranian targets help them in the long run in Syria.
So it's fine to call out Bideng as a retarded hypocrite, because that's a fact. But stop acting like this is going to start WWIII because it's not.
I don't want retaliation, I see US troops even being in the region as wrong and since we still have a volunteer army these people knew what they signed up for. But yes, this isn't going to cause WW3.