Vaccines are not magic. Every treatment has potential downsides. That's why they need approval to weight the potential benefit/harm trade-off.
90-95% reduction of risk.
Maybe even greater reduction of serious disease?
Most common side effect people seem to talk about is something like fatigue and fever for a day or two after a shot?
That's a pretty good tradeoff. Especially when you consider that getting large populations vaccinated pretty much ends the pandemic.