They should be equipped with aerial defenses and machine gun positions forward, aft and amidships, and whatever else they need to keep their cargo and crew safe. Insurers should incentivize this. It’s the new normal.
They are already heavily armed:
Armament
2–3 × Mk 29 Guided Missile Launching Systems, 8 × RIM-162 ESSM or RIM-7 Sea Sparrow missiles each
3–4 × Phalanx CIWS
2 × Mk 49 Guided Missile Launching Systems, 21 × RIM-116 Rolling Airframe Missiles each
Mk 38 25 mm Machine Gun
Oddly as big as they are not much “spare” space.