Everyone may well get it, it does not mean group 'xyz' wants to be the group that a mass outbreak happens within. Take a 100% free throw shooter and a 70% free throw shooter and see how many in a row they can hit. The 70% shooter probably will never get to 100. The 100% will always get to 100. 30% effective still has an impact with large numbers. So the odds of SO being in the headlines for a mass outbreak are higher the more unvaccinated attend. Simple math. I am in agreement with you to an extent, vaccines are not going to stop person A from getting infected. But put 10,000 people in a room though, 30% effectiveness in every person will block those long chains infecting everyone.
But the bigger point is, can not a group self govern? If the people inside Special Olympics want to demand this, and they have the votes, why can they not? Are we ceding to Florida to decide what private groups can and cannot do?
Are we making unvaccinated a protected class? And if we do for COVID, it will happen for all other vaccinations because I guarantee there is a huge crossover between general anti-vaxx and COVID anti-vaxx. All general anti-vaxx are members of the COVID anti-vaxx.