Because you're still allowing people who can transmit the disease around these "vulnerable" patients.

And the line drawn isn't even an arbitrary number, but an arbitrary policy with an assumed improvement.

An improvement that we know isn't good enough to prevent spread in populations with near 100% vaccination rates.

It's a free, safe vaccine that significantly reduces the spread of the virus that has caused a global pandemic over the last 18 months or so. If you're a health care worker and you won't get vaccinated, you probably should find a new line of work.

It doesn't need to be 100% effective at stopping spread to be an excellent idea.

The vaccine isn’t without side effects, and there is still a debate about whether natural immunity is sufficient.

The he side effects are trivial. Just get the vaccine and stop deluding yourself.

No. You’re just assuming that it’s by choice.