That said, I hope Twitter et al don't knee jerk react-to this and block discussion just because it would counter their preferred narrative.
or drugs in general. Just look at adverse effects of Ibuprofen. Common drug, but unlike vaccines, it is not used for whole population at once. So adverse effects even if more common are not that visible.
If these were serious and common however, really the hospitals would be so busy by now taking care of all of them. The number of people that got the vaccine here in europe in the space of the last few months is enormous. We started much later than the US but have caught up in a really short time. And with the exception of the UK most countries have used mostly mRNA types and very little AstraZeneca. As a result we had (and probably still have) higher numbers going through vaccination per month than the US.
Even the tiniest percentage of serious complications would have been flooding the hospitals which were already at high pressure due to covid.