I don't know why you have a problem with it.
No one is going to force you to have a vaccine, but that doesn't mean you're free from any and all consequences of that.
Just like I don't have to have a yellow fever vaccine, but if I do, I can't go to half of Africa or South America.
Why should some idiot anti-vaxxers get to put people at risk of dying everywhere they go?
Really? You can't see the pretty nasty potential of health passports? It's a huge, huge slippery slope. Are we gonna ban anyone who hasn't had the MMR vaccine too? Or any of the others that are all voluntary and often used? I expect it will happen on overseas flights, yep. I just don't see coercion as a sensible tactic. It's quite a dangerous one tbh.
Edit - once again, I will be taking any vaccines. It's not about trust in them. Just don't want our country to take one more step towards the shite you see in China.