The Houthis have already been firing drones at US warships; I don't imagine firing rockets at US-flagged cargo ships would be any more of an act of war than that.

> Attacks on US flagged ships are acts of war against the US, which you would think would cause hesitation on the part of the Houthi and Iran.

Meanwhile, attacks on EU vessels will likely attract sympathy for the attackers from the EU.

Indeed, Stockholm is in EU

Attribution for these is difficult. Many non-state actors involved. Maybe the US can launch another failed war against a concept (terror, drugs, etc)

There isn't any question that Iran proxies, including the Houthis, have been attacking American assets. No major actor disputes this. The tricky part is what to do about it. The Iranian proxies have been trying to strike a balance of harming/harassing US forces while keeping the attacks at a low enough level to avoid a major retaliation and full blown war. Calibrating the right response is not a trivial problem.

this ain't obscure APT hacking.

in this case it's pretty clearly the Houthi-let Yemeni government, which is a proxy for Iran, and all parties have been pretty vocal about it.