People kept sailing past the Houthis even though some ships got attacked. They sailed past Somali pirates too. So ships obviously tolerate some level of risk from violence.

Yeah, Ansar Allah were quite nice even when attacking the civilian ships. Not a lot of victims.

Iran is not very nice to the ships, judging from videos and results of attacks.

There's a very noticeable difference. There are no parties, music videos, ship tours to abducted ships... with Iran, etc.

With Iran, the ships end up like this https://t.me/QudsNen/216170 or this https://t.me/presstv/179430