Ansarallah did this consciously as part of their strategy. I remember a spokesperson stating “we will turn the Red Sea into a flaming warzone” as their threat if the bombing and invasion of Gaza didn’t stop.

Ansarallah is inflicting direct damage on ships past the air defense network of the American fleets, but even if they weren’t, just the American fleets being there and launching air defense systems constantly and flaming debris of missiles and drones raining down is sufficient deterrent.