Because unvaccinated people cause hospitals to be overcrowded.

Does this also extend to the willfully obese? Smokers? Chronic drug abusers, alcoholics, etc? It is my impression these are compounding factors listed as comorbidities to Covid, however we don't seem to focus on these segments of the population much, perhaps because of our own personal biases as most humans in this age fall into one or more of those categories.

What do comorbidity have to do with this? It's a total strawman in the context of the situation, considering that those people can also get vaccinated and hopefully not waste their time and our doctor's time by occupying a hospital bed.

Comorbidity has quite a lot do with cause of hospitalization. One study [1] observed that 94.9% of people hospitalized for severe COVID-19 had at least one underlying medical condition.

[1] https://www.cdc.gov/pcd/issues/2021/21_0123.htm

The risks from corona for vaccinated people are negligible. Without unvaccinated people a the measures that are still in effect could be removed.

If the risks from corona for vaccinated people are negligible then stop the lockdowns. If you are vaccinated there's no risk to you right?