bump, the problems with such an idea are many. I don’t claim that any single problem is insoluble, but combined they make for a pretty huge bar against such an idea.
How do you keep your pirate hunters honest? The temptations for going free-lance, as it were, would be huge.
What does the pirate hunter do with the pirates when it catches them? The sort of vessel you suggest doesn’t have the room to hold prisoners for any length of time. Hell’s bells, I was on a 12,000 tonne vessel that had no space to keep prisoners. By far, the simplest thing would be to allow for summary executions. AIUI that would also be legal - piracy being still an official death penalty crime under international law, too. But can you imagine the fuss of having private contractors empowered to act as judge, jury and executioner? Even my gut reaction of, “give 'em a fair trial and hang 'em,” stumbles on that set of circumstances.
Related to points 1 & 2, if they are empowered to mete out punishment, the temptation for claiming that “persons X, Y, or Z were pirates, and that’s why they’re dead and we’ve confiscated their ship,” is going to become astronomical.
Local governments will fight such free-lance policing tooth and nail. The very proposal for such an idea is going to be seen as a huge slap to the government: an indictment that they cannot control their own territory. While you can argue that Somalia is effectively a non-state without any government, that’s not the case with other piracy hot spots, including Indonesia and Thailand.
Finally, while they are a minority of the cases, there are hints that certain powerful nations have supported piracy to steal ships, as well as cargoes. ISTR a few years ago an Australian flagged oil tanker ended up in one of the southern Chinese ports, under ahem disputed management. While flagged naval vessels aren’t likely to be attacked by such nations, simply because of the potential for escalation beyond anyone’s ability to control; there’s no such disincentive to attack a free-lance piracy patrol vessel.
On preview: Or one can go with the simple answer that MGibson gave. :smack: