Didn't we say that cruise holidays tended to be popular among those without P trait? I imagine most elders who enjoy cruises to be N or NA types, many of whom never develop a marked aversion to and/or weariness with the human race in general, or spare much thought to the hygiene pitfalls of being aboard what amounts to a giant floating apartment block with communal eating and recreation areas.
A probable issue for the Diamond Princess is the ventilation system circulating contaminated air. Shared surface areas also make it common for viruses to spread aboard ship: https://www.verywellhealth.com/norovirus-the-cruise-ship-virus-770290
Liners have had to cut voyages short due to an abundant spread of illness: https://abcnews.go.com/US/270-cruise-ship-passengers-sickened-norovirus-royal-caribbean/story?id=60291868
Occasionally I inform those who like public or hotel swimming pools about how disgusting these are. According to the CDC the average swimmer adds 0.14 grams of excreta to the water, then there's urine, other bodily fluids, effusions of sweat, hence bacterium. Most pools aren't cleaned more than once a week, and they don't call them 'piscinas' for nothing. Indeed, explaining in clinical detail the repulsiveness of pools to holidaymakers can be a hobby in itself. Gather round breathen, and receive thine anti-aqueous-sharing evangel...
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