The vaccine passport isn't just being discussed for international travel. It's being offered as an example for everything.
The vaccinated go back to normal, the non-vaccinated stay at home. That leaves us in a bizarre world where the formerly vulnerable are now off out down the pub and the non-vulnerabal are still staying at home to... erm... protect the vulnerable that are currently sat in the pub?
That's not tough shit, that's mental shit. But even if I were to concede that it is tough shit, why is tough shit now an option? It hasn't been until now. "We're all in this together".