And that's exactly the point. Once it launches it either crashed down or stays up. As for this vaccine it got 30k tests. It's the equivalent of before launching said bridge the entire heavy machinery of the construction company stood on it and didn't collapsed.

The Italian bridge that collapsed after decades because of faulty assumptions about the concrete involved is a more accurate comparison. Assuming we know more than we do, and thinking it has no serious side effects because non have appeared in the first few months is not logically consistent.