In many states, an employer can fire you for almost ANY reason. Exceptions are laws which specifically protect a certain status. Vaccination (or lack thereof) is not a protected category under the law. Therefor, an employer has the legal right to fire you if you refuse vaccination. In Arizona, you can be fired for getting a tattoo, having hair the wrong length, etc.
No one has a right to a particular job. If the conditions are agreeable to you, work and collect your pay, If not, quit.
I think it is stupid to require young people to get vaccinated for COVID. But no one is forced to work there. Comparing it to death camps was stupid.
Since it has designation of being used for Emergency Use Only, it is not considered a vaccine yet. It is considered in a trail test to determine its effectiveness, or lack thereof. All the people taking the injection are nothing more than guinea pigs, and therefore, the employers cannot compel their employees to participate as uncompensated guinea pigs. They can fire them for other reasons, but not that.