@Bythemillpond
If the vaccine stops you getting Covid. Why then do we need vaccine passports only after everyone has been offered the vaccine and presumable enough people have had it to give herd immunity or very nearly?
Why are vaccinated people saying they won’t mix with the unvaccinated if it won’t affect them?
Vaccines are not 100% from everyone who has it. If they say 90% have immunity that's not everyone has 90% immunity. That's out of every 100 people, 90 have immunity, and 10 don't.
You don't know if you're one of the 10 or one of the 90, so if you are vulnerable then it's fair enough you can be nervous.
It's also protecting the (generally vulnerable) members of the population who cannot, for various genuine reasons, have it.
If you are at a gathering where 100% of people have had the injection, and it's 90% accurate, then, say with 30 people that's 3 people in the room who potentially have it as the injection hasn't worked.
If it's 75% people have had the injection, that's about 7 people who haven't had it, and about 2 who the injection hasn't worked. So 9 people in total-3 times the risk that one of them has it and you come into contact.
If it's 50% of people, that's 15 people who haven't had it and 1-2 (1.5!) who the injection hasn't worked, so 16-17 people, more than 5 times the risk.
Add into that that on average the people who haven't had it due to a decision are certainly perceived as being more likely to think Covid is made up and take risks, so more likely to come into contact and less likely to wear a mask. So the perception would be that they are a greater risk on top of that.
Whether that's fair or not, I'm not sure.