Are Security Services Public Goods?

Just wondering.

An Italian cruise ship with 1,500 people on board fended off a pirate attack far off the coast of Somalia when its Israeli private security forces exchanged fire with the bandits and drove them away, the commander said Sunday.

Cmdr. Ciro Pinto told Italian state radio that six men in a small white speed boat approached the Msc Melody and opened fire Saturday night, but retreated after the Israeli security officers aboard the cruise ship returned fire.