You’re absolutely not incorrect on vaccines for the diseases you cited, but Rural Carrier also has a valid point. A shot for influenza ( a type of Coronavirus) is about 30% effective at best IF the vaccine is a good match for that seasons strain. We still have no vaccine for any of the known Coronaviruses, so some skepticism about a Covid 19 vaccine being available ( or effective) anytime soon is warranted.Hopefully we get some effective therapeutics, and that could happen long before any vaccine emerges. Anyway, we all want to get back to our beloved Island in the sun soon, and some of us will go as soon as we are allowed to. Others will wait until they feel the risk is less. It’s a personal decision and everyone’s situation is different.