Yes. 'bl00 might help quantify concern more, but this is at least a moderate escalation. It sounds like what mk once outlined, that Trump could start a war to distract from domestic woes. Of course we should worry about how much escalating the tension may appeal to Trump as a welcome diversion to impeachment and related news: I'm no expert on whether or not we should apply some sort of leverage to Iran, but are we not weary of wars in the middle east yet? I'll be back tomorrow with a more nuanced opinion, I'm still taking in details.
The tricky part is Iran has no real reason to fight a "war." They beat Iraq to a stalemate but it was awful. Meanwhile between Hamas and Hezbollah they managed to decapitate the CIA, blow up the Marine barracks in Lebanon and generally get what they wanted (and Stinger missiles - thanks, Ollie!) without having to fire a shot. cgod is right - Iran is unstable, has been unstable, continues to be unstable. Realistically speaking, we ran Iran for 30 years when we destabilized Mossadegh. Also realistically speaking, 35% of the crude and CNG in the world flow through the Strait of Hormuz and Iran already attacked Abqaiq, one facility that refines 7% of the world's petroleum all by itself.