The Jones Act is a problem and a blessing. It ensures a US maritime industry, albeit tiny. Still, due to lack of competition, it has left the US maritime industry so far behind the world standard that the minute it is removed, the entire sector will go bankrupt from international competition.
The Decline of the U.S. Merchant Marine | What's Going on With Shipping?
Because the US Navy patrols the waters and keeps piracy down. The areas it doesn't patrol are infested with pirates. It costs quite a bit to do this, and if the US Navy steps back other countries will have to step up.
It's not just piracy, it also is a matter of keeping other nation states from preventing interference. Zeihan also says that piracy will be state sponsored.
The Decline of the U.S. Merchant Marine | What's Going on With Shipping?
https://www.youtube.com/watch?v=kJn0bCWx_9g