Honestly, I disagree with the FSF's interpretation on this. Use of the word
"piracy" to describe copyright infringement is almost as old as copyright
itself, even found in old court rulings, and I don't think there's anyone
alive today who honestly believes that copyright infringement is "the moral
equivalent to attacking a ship", as RMS puts it.
Heck, I don't think even traditional piracy is associated today with "kidnap
and murder". That article was the first and only place I ever heard of that
association. It's more associated with traditional sailor traits, eye
patches, buried treasure, and an accent that I want to say is a Scottish one,
though I'm not entirely sure. Then you have things like the joke in The
Martian about the main character technically being a space pirate. Really,
the word "pirate" is not as dirty of a word today as RMS makes it out to be.
The only way you can get a negative reaction to the word "piracy" is if you
explain that you're actually talking about real people committing real piracy
at sea. This is what happens when you make a smear term like this; it might
work for a while, but eventually, the word just loses all of the intensity it
used to have.
I don't think it's helpful to police people on using the word "pirate" to
describe sailors that go around saying "arr" and looking for buried treasure.
I also don't think it's helpful to police people on using the word "piracy"
to describe copyright infringement.
