That much was obvious. Young people weren't asked to take the vaccine to protect themselves but to protect the herd.

Despite the fact that the clinical trials didn't test for ability to stop transmission and infection. So the CDC, FDA, and Pfizer outright lied to the public. And when that lie fell apart, it was so 'you don't overrun the hospitals' despite the fact that young people weren't being hospitalized at any rate more than the seasonal flu.

And for anyone skilled enough in mathematician to check the assumptions for the formulas for "herd immunity": It was clear from the beginning that the term "herd immunity" was based on totally unrealistic assumptions. These are seasonal viruses - and outbreaks were following strict mathematics fitting a seasonal outbreak. This was clearly visible from the beginning (people posted formulas for that in early 2020....). The term Herd immunity absolutely doesn't make any sense for a seasonal virus like this. There is no such thing as a constant R-Value. That model is based on stochastic independent infections... (which is very unrealistic... and dumb...)

Pfizer didn't. Their press release distinguishes between SARS-CoV-2 and COVID-19, only claims they prevented symptoms in people not previously infected by the virus, and didn't make any claims about infection/transmission. It was the conflation of the two terms in the media, referring to the virus as "COVID-19", that resulted in this mistake.

And even so, for several months articles were coming out questioning of it stopped infection/transmission at all. It was only once we got a few months into 2021 that that got buried with the assumption it did.

I think you jumped to a conclusion. COVID still kills vaccinated individuals, just at a lower rate than unvaccinated.