Of course they work. Big Pharma is making Big Money at unprecedented level.
And what about people's health? It actually doesn't matter, because vaccines are not about health, they are all about money.
It doesn't matter. It's the same question as whether abolishing due process or the jury system or making encryption illegal would reduce crime. We don't mandate medical procedures because it violates bodily autonomy. Heard of the Nuremberg Code? We don't simply look at effects to decide what to do; there are also important principles at stake.