So you allow these people to search your luggage?? By what right?
Bit late to the party - but you really don't know ships, even before the current terrorist situation.
Going into the docks with a vehicle needs passes, getting to the quay needs a pass and then when the security people see a soft bag in amongst the flight cases, they stop. "what's that?" That's the singers clothes. Ah sorry, that means we can't unload - you have to join the passenger queue at the terminal, so every single flight case then gets opened, emptied and inspected. We have plenty of radio mic and monitor systems which have to be inspected (by non-technical people) and my Icom scanner - which we use to check our radio channels was frowned at, but I said it was part of our technical kit, and allowed on. I actually found that ships comms are frustrating, if I wanted to listen, so after a few hours curiosity, I didn't bother. The Faraday cages, that are what make up these ships makes range a real problem, with many ship wide services being very local, per frequency, and hardly anything interesting goes on apart from security, which use digital radios now. The operating crew - the sailors, if you like, still use marine VHF but I found the content dul in the extreme. Most traffic you will find concerns the housekeeping side of things - and chambermaids, bar workers, stock, spillages and toilets. Never found anything interesting.
If you do take a scanner - the theatres can be interesting if you like how shows run - all analogue, with digits only just creeping in. Bands a mix of American and EU epending on the cruise line.
One thing concerning security - the ship's master is God. Your ticket conditions allow them to drop you off in a foreign port on the quayside if they wish - and nothing you can do about it. They share passenger details of troublesome guests and do the same with crew. Get banned on one cruise line and you'll find you are blacklisted very quickly in the cruise business. Your life on the cruise ship revolves around your credit card, so if they don't like you they simply don't accept it as payment - credit cards are NOT authorised on a transaction by transaction basis at sea - and updated in port when comms is connected, so they are used to people running up tabs and then having issues collecting - so have great systems to stop people abusing credit cards. Read the terms and conditions you agree to. Money and security - behaviour and attitude are all there. Following orders is in there too. At sea, they can do what they life to maintain the safety of the vessel.
People who cruise a lot like the results of this - some new cruisers cannot accept having rules.
The crew are not allowed to drink alcohol. It's in the contracts, yet they have a crew mess with cheap booze prices. It gives the cruise line a big lever. Everyone breaks the rules, so when they do something properly silly, the cruise company can eject them without any issues or complaints process as they'd have on land.
If you are single and chat up one of the entertainment or catering staff, they can be fired - fraternisation is detailed in scaring detail. It goes on of course, but loads get fired - usually just as the ship docks in some out of the way country. They keep the passports, so a foreigner abroad without a passport gives them plenty of capability to be strict.