And who told you that it doesn’t reduce the chances of serious illness and death? Some tinfoil hat wearing Trump-supporting dickhead in a QAnon sponsored video? Would you not suggest that anyone gullible enough to believe what they are told by some random crank is beyond help?
The stats speak for themselves regarding vaccine efficacy. Unless you think pretty much every government in the world - some of whom are currently bombing the shit out of each other - have put their differences to one side and gotten together along with many prominent scientists and are releasing false data. Seriously, if you’re going to go full on with Covid conspiracy theories then I politely suggest you fuck off and take them elsewhere.