To vax or not to vax HAS to be a choice issue. Abortion choices are a similarly argued issue - whose body is it?
If the colleague is prepared to accept the consequences of their actions and end up in ITU so-be-it - however annoying and expensive that is. Smokers have an impact on the rest of us too. And how about riding a motorbike? All our individual choices have an impact on other people: the last minute road crosser that scares me, the person who drives on one glass of wine, the person who leaves a car "for only a minute" whilst they shop etc. In fact, it has been shown that the charity heroes who do parachute jumps are so frequently injured they cost the NHS much more than they raise. But they are heroes right?! They are not being thoughtless at all. The activity is not the issue, it is the consequence.
We all have reasons for minor acts of self-serving behaviours. We are not robots and we have even that right: to be selfish. If the impact is too great on the community we have rules and laws - smoke outside, pay a fine, go to jail.
I'd rather not be impacted by a colleague in isolation, so why does the firm not find them a work from home option? Or the government should insist on a daily test for non-vax folks.
Nonetheless, I do not support any non-consensual control over another person's body. That could be with medicine - including vaccination or surgery, acts of aggression or sexual violence (I am a nurse). Of course, the detention of a body i.e. prison, is control over a body, but it takes that body and keeps the community safe. Isolation/quarantine does the same.
Both situations respect the right to have a body and make free, informed choices about it ourselves, whilst at the same time finding ways to keep the rest of us safe.
No one would advocate for forced sterilisation these days, even for fatal diseases that are only inherited. Compulsory vaccination is nonsense.