(Bloomberg) -- Houthi militants hit a US-owned commercial vessel with an anti-ship ballistic missile on Monday, underscoring warnings that the world’s most important trade artery remains too risky for navigation.Most Read from BloombergUS Merchant Vessel Struck as Shippers Told to Avoid Red SeaIowa Latest: Trump ‘Honored’ By Win Against ‘Great Competition’Apple to Pull Blood-Oxygen Tool From Watches to Avoid US Ban If Appeal FailsUS Economy Set for Another Cash Boost If Congress Backs Tax DealSt