Our public health systems are extremely limited, covering only those of retirement age, former members of the armed forces, those holding certain political offices, and a select few (proportionally speaking) with certain disabilities. The vast majority have to rely on private health insurance, and almost all hospitals / healthcare networks are private.
Next, the amount of beds in each hospital must be approved and licensed to insure each hospital actually has the resources to provide care for those patients (they have the right kind and number of staff, the appropriate equipment, etc). Beds are separated by types - standard, ICU, pediatric ICU, etc. So each care providing facility is extremely limited, and resources are extremely limited, in the wealthiest country in the world.
A rough estimate is that only 18% of citizens have any level of public health coverage.
With all of that in mind, the unvaccinated are choosing not to do the right thing for the good of the public health of all, and in neglecting to do the right thing are ending up overwhelming the system and depriving those who are acting in good faith of care the people on the right side are paying for.
So in short motherfuck the unvaccinated. If they want to be that catastrophically selfish and reckless, then let they should be put in the back of the line when it comes time when they come down with the plague that is facing us all. They need to take some personal responsibility.