Your examples are not the same, you're presenting cause and treatment. The parent comment discussed one treatment over another: refusing preventive treatment over curative treament.

Problem is that there is not enough capacity for curative treatment only. In this case it would make sense to allocate some hospital capacity for people without vaccination, and more capacity for people that have been vaccinated (maybe in the same ratios as population vaccination).

And also allocate some hospital capacity for people with other diseases so they're not impacted by the fact that some people refuse vaccination.