OMAHA, Neb. — In February 2020, David Cates, a psychologist, was working with passengers of the Diamond Princess cruise ship who had been exposed to the coronavirus and were quarantined at a special facility in Omaha, Neb. In a meeting among passengers and their doctors, there was talk of testing, meals and logistics, he recalled, and then one person asked, “Is there a channel on the TV that can help us relax?” That’s when Cates realized that those passengers, among the first who had been exposed to a deadly virus — and who were now isolated in 300-square-foot rooms — might need regular psychosocial support. Every day of their weekslong quarantine, Cates facilitated virtual discussion sessions about stress, mindfulness and healthy thinking. A passenger spoke of fearing eternal isolation. The doctor encouraged a different thought: “This is much longer than I wish, but eventually, I will be able to leave.” Six years later, Cates is once again supporting cruise ship passengers exposed to a deadly virus.…