The most logical thing to think about is this "if the polio is not caused by the virus, then the vaccines will be ineffective... But the vaccines had been effectve for a time now and eradicated the polio... sooooooooo"
I think he's starting from the premise that all vaccines are ineffective. He's hoping to prove that vaccines have never been effective in the past, therefore the Covid vaccine is useless, too.
However... the proof has failed quite dramatically on his first try, Polio. Perhaps next he'll fail to prove why the smallpox vaccine is ineffective. Or he might go even bigger, and fail to prove that life expectancy hasn't increased dramatically around the world since the advent of modern medicine. Let's wait and see.
It won't be the first time he's been presented with the life expectancy argument. He just thinks he's right no matter what you say. Honestly, it's frustrating to see such a large amount of people believing in stupid arguments like these.
Thanks to vaccines and modern medicine, life expectancy has risen dramatically, let's also keep in mind how often it would be for babies to die after birth.
