Unfortunately cruises are a gleaming white target for the media.

No one is making news articles about to people at hotel/resort X testing positive.

Do the big theme parks in orlando test all patrons coming in the gate and leaving at night?

Given the target factor, it is Silly for the cruise lines not to make it a 100% vaccinated cruise for the next few months.

Some cruises are and they say if you are unable to vaccinate for whatever reason (too old, immuno compromised, young kid, etc) find another vacation.