Given that vaccination significantly decreases an individual's risk of hospitalization and that only about 40% of Missippippians are fully vaccinated, it seems like we would be justified in inferring that the people filling the ICUs are generally unvaccinated, no?

Filling the icus might only mean adding 4-8 heads over existing load though if you only have 20-30 beds and you are running 70-80% as a baseline

The ICUs are full of people with suspected covid. Vaccinated people are less likely to have covid. 40% of Mississippi is vaccinated.

Which point are you having trouble with?