Which cruise lines are taking precautions to protect the people from pirates?

The majority of piracy issues have been around Somalia, and most of them actions against freighters and container ships rather than passenger ships. (A notable exception was when a small group of terrorists took the Achille Loro and killed a disabled passenger and dumped him into the Mediterranean a few years ago.) It is, therefore, unlikely though not impossible that your ship would be bothered by pirates. That being said, I will tell you that in 2005 I was on a Mediterranean cruise with the Queen Elizabeth 2, and while we were in port they sent scuba divers under the ship to check the bottom to be sure nobody had attached anything — ahem — harmful. Most passengers did not know about that, but in Alexandria some passengers did see the scuba divers and ask questions, so the Captain made the announcement. As I understand it, the cruise companies are trying to be extra careful about security on board, in port, and while underway, although they prefer to not to discuss it. I was recently on the Costa Fortuna — Ft. Lauderdale, through the Caribbean, and over to the Canaries and Madiera, ending in Genoa — and wouldn’t hesitate to travel again soon!