It's not about the "oh it's worth the risk compared to COVID 19". If it's a side effect it wasn't spotted in the trials, why was that?
It's not a side effect? It was a problem in production? What problem? Was is tampered with or was an accident? What failed in QA to let that batch come to the public? Was is a storage problem that compromised the batch quality? Was it while in transport or in the local hospital?
You talk about this like background noise. It's not. It should be investigated.
It's good that this is happening, because it shows regulators are doing their job. This is what builds trust in vaccines, not disregarding odd occurrences because they seem to have no "statistical relevance". That's just ignorance talking.