@TeenPlusCat
Depends what you mean by 'mandatory'. If literally the police are locking people up for not being vaccinated, regardless of other behaviour, then YANBU.
If you mean people in a pandemic are more restricted if they choose not to have a vaccine that is proven to reduce transmission and severity, then YABU. Ditto if people want to work with vulnerable people.
What if abortion is not illegal, but we were to heavily discourage by means of restrictions and deterrents for women who choose it? Do you think a person could support that and still be pro-choice?
For example, requiring women to pay for abortions, and for treatment for any complications afterwards, while pregnancy care and births are still free. Would that be fair? I would argue that when you disincentivise a choice in that way, for many people it becomes not really a choice (i.e a woman on the poverty line will opt against abortion because she cannot afford it), and thus it's not consistent to call yourself pro-choice and yet support it. This is obvious to anyone when it comes to the abortion debate but apparently not when it comes to the vaccination debate. This example is roughly similar to what many are advocating with regard to making the unvaccinated pay for any Covid medical treatment they need.
There is a point at which restrictions and disincentives edge into the territory of coercion, and society has generally agreed that medical coercion is unethical.
The vaccine also is not proven to reduce transmission, certainly not any more than alternatives such as regular testing would.