There is no coercion by public agencies. Families and some companies such as restaurants may be coercing, but that's their business.
You have set a low bar. Anything is coercion in that case. People try to shame one another for all kinds of reasons. A child crying for an ice cream cone is coercion. Your wife acting snippy because you did not clear the table is coercion. Demanding your family member attend church services is coercion.
That is a precaution because immunity can fail for any disease. People occasionally get sick again from an infectious disease even though they had it before.
I didn't set the bar, liberal looney's did that years ago. I still live by sticks and stones