answer.
Don't know how to achieve 60 or 70% level immunity, but admit it's the reality we have to get there.
Don’t know if the vaccines under developing can get our goal.
Admit we don't really don't really the origin of 1918 flu, and we don't know what happened to the virus of the past 10 pandemic.
Reject demand of a universal magic answer/response. If any answer/response is viewed good, it is only good today, not necessarily good in long term.
This is the attitude that a scientist/expert should have, being honest and not afraid to say we don't know.