The point in my sharing this as 'anecdotal' is that this is my subjective view, and that from where I sit, these conclusions might follow but the correlation might be coincidental too. I.e maybe I avoided serious illness for some other reason; maybe I have no antibodies and the vaccine didn't trigger a response in me but I'm one of many who had it mildly. There are any number of other possible explanations. I'm not making any scientific logically bullet proof statements here, I'm speaking as an armchair pundit thinking "hmm, seems like a lot of vaccinated people I know have the virus all of a sudden. Seems like vaccines might be helping with the severity of the illness, maybe I was one of them. However, I wonder if all this means we should exercise just a bit more caution until we're sure this high infection rate isn't a problem in the overall fight we're engaged in".

The actual hard logic and policy I'll leave to the scientists and policy makers but, in the UK, at least the latter have a chequered history.