I understood you correctly Mik. Crap happens, even to good people and nothing can prevent this, though you can offer some retorts, these usually rob some personal freedoms as a result.
Currently, ships are being manned by professional anti-pirate teams. The British didn't stamp out piracy, so much as kill, impress or made it less viable to continue as a pirate in that particular area. The trade continued, just around the fringes of the empire's influence, to avoid trouble.
Gun laws in the USA come with a damnation of other issues. Look at the number of gun violence occurrences in your country last year and compare them with the USA. We're not a bunch of homicidal maniacs that the statistics show, but the moment you introduce guns into the mix, the odds of being involved in a gun incident, rise exponentially. This particular aspect of USA's society will eventually change, but it's likely some nut job will have to run into congress with an AK and mow down a few key senators, before any real legislation is passed (it's happened before).
Other countries around the world have the same mental health problems as the United States, play the same video games, but manage to avoid absurdly high gun murder rates and frequent shooting massacres. If you add up the populations of France, Germany, Great Britain, Japan, Switzerland, Sweden, Denmark and Australia, you have about the same as the USA. In 2012 (the last year I could find info for all of them) the USA had 34,000+ gun deaths and the combined nations list above, had less than 150. Is it that we are just a murderous bunch of rabble, or is it the simple fact that all of the countries listed, have strict gun control laws.
Lastly, as history has repeatedly proven, you can't sucessful make war on a concept, idea or belief. Without due process, how do you insure the fishing boat that is provocatively approaching, is a pirate or simply some boneheads, not realizing they're crossed an imaginary line. Having a skipper make a snap decision as the closing rate continous, isn't due process and is fraught with potential mistakes. Yeah, you'd get some bad guys, but you'd also get some innocents, which is the basic crux of this type of preemptive behaviour and why rule of law works, if a bit ponderous at times.