You deniers realize if the internet had been around in the 50s for you all to goad each other on, then we’d never have eradicated polio? Idiots.
That's a rather simple marketing trick used to manipulate people, but it's not true. In the 1950's they didn't even have the benefit of knowing all of the good that comes from vaccinations. It was completely new, and then ran into the worse case scenario where bad batches, gave a lot of kids polio and even KILLED some, yet parents were still lining up around the block to get their kids to take it.
Why the difference? It's because polio was virulent, and it was killing KIDS. Folks were desperate for anything, experimental or not, and so their risk/reward ratios were different. The really shallow thinkers out there believe the propaganda and think that these new vaccines are exactly the same as all other vaccines, so they don't realize the increased risks, or they just have blind faith in "science" and/or their doctors. However it's not reasonable to expect that everyone would come to the same conclusion. If you're a 21 year old athlete, you know if you get COVID, you aren't likely to even be symptomatic, so why assume any risk, let alone significant risk.