By their nature, vaccines create permanent changes to your body’s immune system. Specifically:
“The adaptive immune system evolved in early vertebrates and allows for a stronger immune response as well as immunological memory, where each pathogen is “remembered” by a signature antigen. The adaptive immune response is antigen-specific and requires the recognition of specific “non-self” antigens during a process called antigen presentation. Antigen specificity allows for the generation of responses that are tailored to specific pathogens or pathogen-infected cells. The ability to mount these tailored responses is maintained in the body by “memory cells”. Should a pathogen infect the body more than once, these specific memory cells are used to quickly eliminate it.” (Source: https://en.wikipedia.org/wiki/Immune_system#Adaptive_immune_system)
Because they make permanent — and potentially harmful — changes to your body’s immune system, no vaccine should EVER be mandatory. Rather, it should be the owner’s decision.
No, I’m not an anti-vaxxer. I spent 20 years active duty military (plenty of shots, there!), and 11 years later, I continue to obtain boosters for diseases I stand more than a snowball’s chance in hell of encountering, including tetanus and shingles.
Even thought it should be the owner’s decision, there are many professions where you simply cannot be a carrier, much less risk becoming ill with the result being you cannot perform your duties. The military (obviously), first responders, medical professionals, teachers, and others who have close and frequent contact with the public.
If you’re an anti-vaxxer, go work in a warehouse, work from home, or find a job more suitable to less than “close and frequent contact with the public.”