Question: Why is the CDC not allowing crew members from disembarking their ships?

Answer passage (source: CDC):
page_title: Cruise Ship Crew Member Disembarkations
section_headers: Frequently Asked Questions
What are the requirements of the attestation that cruise lines are required to sign before crew can disembark, or transfer to another ship?
section_content: By signing the attestation form, cruise ship operators agree to follow
specific conditions that are designed to allow crew to safely disembark while
protecting public health, including the following:

Arrange to transport crew members to their final destination (US or overseas) by industry-chartered private transport, industry-chartered private flights, or personal vehicles (no rental cars, taxis, or ride-share services) with measures in place to ensure neither those involved in transport nor other members of the public are exposed to the disembarking individuals.
Screen disembarking crew members for symptoms of COVID-19.
Ensure crew members with known exposures to COVID-19 are transported separately from those with no known exposure.
Provide face coverings, such as a cloth face covering, to disembarking crew members or confirm that they have their own face coverings.
Instruct disembarking crew members to stay home for 14 days and continue to practice social distancing after reaching their final destination.
Ensure disembarking crew members: 
will not stay overnight in a hotel before the flight or at any point until they reach their final destination
will not use public transportation (including taxis, rental cars or ride-share services) to get to the airport/charter flight
will not enter the public airport terminal
will not take commercial aircraft after an initial charter flight
will not have a transportation layover exceeding 8 hours
will not have interaction with the public during their travel home or to their new duty station (e.g., rental car companies, restaurants, other public areas)




Reviewer feedback on this answer:
Answer does not say "why" crew members are being discouraged to disembark from their cruise ships but does give guidance for what criteria crew members have to meet in order to be able to disembark as well as what behaviors need to follow after.
This is information about what companies must do when the crew members are allowed to disembark from the ship.

Reviewer ratings:
Acceptable
Bad

Answer passage (source: CDC):
page_title: Cruise Ship Crew Member Disembarkations
section_headers: Frequently Asked Questions
What is CDC doing to ensure cruise lines are adhering to the No Sail Order?
section_content: CDC has provided Interim Guidance for cruise ships during the period of the No Sail
Order to help inform the plans that cruise lines develop to prevent, detect,
contain, and respond to COVID-19 on their ships.
CDC is committed to the safety and well-being of crew members while onboard
and as they disembark. Crew members on ships in or intending to be in US
waters who have questions about the process for disembarkation or who have
concerns about what their ship is doing to prevent COVID-19 onboard can share
their questions or concerns with CDC by sending an email to
eocevent431@cdc.gov
CDC is also reminding all cruise lines in U.S. waters or seeking to operate in
U.S. waters of these requirements. With the assistance of its federal, state,
and local partners, CDC stands ready to direct ships that do not comply to
leave U.S. waters. CDC also reminds cruise ship operators that those who do
not comply may be subject to criminal penalties.

Reviewer feedback on this answer:
Answer does not give a "why" for not allowing crew to disembark from cruise ships but gives a lot of answers to process and information for "Interim Guidance" and an email for the crew to contact the CDC with questions.
There is some information about why they are being forced to stay onboard, but only offers and email for questions and concerns.

Reviewer ratings:
Could be Improved
Could be Improved

Answer passage (source: CDC):
page_title: Cruise Ship Crew Member Disembarkations
section_headers: Frequently Asked Questions
What is CDC’s legal authority for preventing crew who are U.S. citizens from disembarking cruise ships?
section_content: CDC is using its legal authority under the No Sail Order and 42 CFR 71.31(b),
71.32(b) to stipulate specific conditions for the safe disembarkation of crew
in a manner that will not endanger the public’s health. Having cruise lines
sign a legal attestation is one method of ensuring that these conditions have
been or will be met. CDC is not detaining crew who are U.S. citizens or
preventing them from entering the United States. We are hopeful that more
cruise lines will take the necessary steps to ensure that their crew members
get home safely in a way that will not risk the health and safety of our
communities.

Reviewer feedback on this answer:
Answer is being very clear about "specific conditions for the safe disembarkation of crew" versus "detaining crew" that are U.S. citizens as being part of not causing a public health issue.
There is a full explanation as to why the CDC will not allow crew to leave the ship and what procedures are being followed.

Reviewer ratings:
Excellent
Excellent