There really is no need to be extending beyond June 21. The evidence is that vaccines work, overwhelmingly so, and if you're young then you are extremely unlikely to suffer from Covid which means that the risk/reward ratio is very much in favour of going ahead with June 21.
So despite what the 'Scientists for Hire' may yell, they can STFU.
“Vaccines work” is hardly a revelation, to be honest. That’s not really the point.
Vaccines do not eliminate the risk of Covid. There is increasing evidence that a single dose of vaccine does not provide fantastic protection against the Indian variant.
Some important figures in the field are questioning the wisdom of the 21st of June date, and I would rather take on board what they have to say than just tell them to “STFU”.