I am surprised that you see that as 'attack mode', Steve.

I tried Googling "Mumsnet Captain Tom Vaccination" but all I got was an opening page with a couple of messages wishing him well and subsequent pages, each with a message saying that the thread had been deleted. The message acknowledged that the majority of posters were wishing him well, but said that posts speculating on his health or other aspects did not seem to be in the spirit of the site right now.

There was nothing that I could find that told me anything about discussion on the effectiveness of the vaccine. Perhaps you could provide a link?

DC