Obviously a touchy subject but the fact is that vaccination has prevented (I won't use the word saved) countless deaths. Older people and vulnerable individuals particularly have benefited from being vaccinated. Have some people died because of the vaccine? Yes, but the same goes for almost all medical interventions.
However, I don't believe that vaccination should be mandatory for anyone. That's an individual's choice.
What I don't see is the actual scientific reason to exclude non vaccinated persons from any situation. Why is attending some sort of Watchtower School any different from going on public transport to get there, or popping out to Starbucks in the interval to get a coffee.
The reality we face is that Covid is with us to stay and we have to learn to live with it. Many choose to get vaccinated, others not, and how ill you become when you get it - not if you get it - depends on many, many factors.