Some of these deserters may be having emotional or mental problems. Others may have problems with a firm commitment to anything or to anybody other than themselves. The self discipline of freely taken committments are the first stepping stones to being an adult.
You don’t have to ‘like’ every single aspect of your job. You probably won’t. Just accept this duty as your job for the time being. People don’t ‘like’ paying their utility bill, but they’ll do it.
They could have walked out the door without any trouble simply by refusing to get a COVID “vaccine.”