This is a very cogent analysis of why pirates are resurgent. The world's navies have shrunk. When Britain, the U.S., Japan, France and Russia have hundreds of war ships traversing and patrolling the globe and showing the flag its hard out there for a pirate. When the entire world relies on the U.S. Navy for peace on the seas and that navy has 200 vessels pirates can make a comeback. Add in the end of nation states in Africa and you have the base for it as well.
I say nations should return to granting Letters of Marque and allowing pirate hunters to keep a third of the vessels, equipment and guns captured, as well as a bounty per pirate.