I am taking this as serious as "Quarantine for 2 weeks to lessen the curve".
So on the other hand the vaccination is not a real vaccination per se, it is more like a cough drop, it will prevent the symptoms but will not stop you from getting or spreading the virus. But once you have had it you should have Immunity per science prior to Covid which people like the CRC are not remembering.
So where does this leave us, same as prior to Covid, when you go on a cruise you take an inherent risk of everything a cruise could possibly cause. You might break a leg, net the norovirus, slip and fall or now get Covid.