Trump is concerned to prevent the spread of the disease so he wants to keep it confined to the ship, and somehow you turn that into his not caring about the people on the ship?
It's one of those relative morality things. Do you let hundreds on the ship die to save thousands on land? But there's the added complication that you can also save most of the ones on the ship by getting them the hell off the ship.
What he had in mind is what any normal person would have in mind who said what he said.
On the contrary, any normal person would recognize that keeping people bottled up in an incubator of disease is a bad idea. That's why other nations - e.g. Canada - have been working to get the people OFF the cruise ships and bring them home.