I always wanted to go on a cruise, but not any more! I imagine people who are likely to get vaccinated rely heavily on that alone for their protection. Meaning that they feel like they've done enough to keep from getting sick. So they probably have lazy hygiene habits, touch the inside of their mouth, nose, ass and then touch other stuff. Also, they live on the "SeeFood Diet" and make poor choices every day. Now group all these lazy, dirty people together and you have a powder keg of disease ready to blow!