You credit the vax? LMAO. Anyone paying any attention who really wanted the truth could find it, but not you. You choose sources that live to promote vaccination that don't show you the truth.
I gotta admit they made it hard and obfuscate to protect their profits and image, but you have to put the work in. You want some surface understanding. You want to spend a few minutes on your confirmation bias and wrap up the investigation.
Truth will set you free. I invite you to do this with polio. Or anything. The truth is not was you believe. You are very wrong.
"It's easier to fool someone than to convince them they've been fooled."28