That's other point of view I didn't know!.

I'm totally agreed with you in that scenario you wrote. It's totally understandable why the critics for the "no vaccine, no entry/travel" in those scenarios. I didn't thought about that.

Well, I don't recall being forced to take a SARS, MERS or h1n1 vaccine and those were pandemics too.

It's because how quickly covid it spread all over the world in a couple of months, everyone thought it was a simple cold before people stared dying.