Surely they can let the crews who are on ships with no confirmed cases to disembark immediately and arrange for them to go home. Then start working on those who are onboard ships with positive cases. 70,000 people is beyond imagining.
I am sure that all of these people would be willing to get on shuttles and driven directly to the tarmac for evacuation. But SOMEONE has to arrange it. They cannot arrange it themselves. Someone has to spend some money, somewhere. I suppose they could heartlessly only rescue the employees whose credit cards could handle the charges of the plane fare - but really, they should rent a private plane.
The lawsuits an airline would face if knowingly boarding untested employees of a cruise ship would be numerous (should anyone on that plane come down with CoVid - which someone probably will at some point).
Airlines would be willing to provide a jet for very little, for the positive publicity (Delta comes to mind - they would do it, it seems like their corporate policy is in that direction). But SOMEONE has to ask and arrange.
We live in a day when even if Delta has reached out (to whom?) no one is at the top or in charge or knows what to do.
Where do they "disembark immediately"to? I would suggest local hotels, as we've done in California - but the State required the hotel be repurposed just for this quarantine and testing of cruise passengers/employees and the State paid for it.
When the very first disembarkations occurred (before the new policies were signed) the first 60 cruise passengers brought CoVid to many counties, most notably Sonoma, but also my own county and to Long Beach (which ended up with Long Beach being a hot spot - the hospitals tried to quarantine, but there was no PPE and this is extremely virulent).
In short, no one in Florida's power structure wants them to "disembark immediately" (without testing and plans for moving them to their own countries). Further, there's a federal set of rules about immigration - they must be held at the "border" if they are not transiting. They are no longer transiting.
If their employer just bought them all plane tickets - they would be transiting again and I bet HSA would agree to let them go home. Maybe not quickly - but surely...the Federal Government would permit them to use the "transit" clause of our immigration policy?
(And not hold them in camps as if they came from south of the border...although many of them are from south of the border).