% of effectiveness is one relevant variable, you could have an elderly family member or loved one who falls into that category. That's one way to rationalise it if your in doubt. There are also some of the vulnerable all be it lower levels that cant have the vaccine.I struggled coming to terms with how an unvaccinated person is any threat to ones that have had it
Best way to view it is; its safe and it will give you your freedom back whilst protecting others in the process.