I feel your concern about Covid19 and the new variants that have emerged. Many of us are fearful of the Delta variant.
But I think the organizers had to study the conditions to be able to hold the Tokyo Olympics.
The security measures and their protocols to avoid contagion were taken. If the conditions were correct, humanity cannot be in a bubble, it has to come into contact with the virus and be protected so that they can respond with their immune systems.
My thinking is on the side of science, our best weapon against Covid19 is to follow biosecurity protocols and vaccination because there is no hope that the virus will be eradicated soon.
I only wish that the celebration of the Tokyo 2020 Olympics was not a mistake due to all the fears that may arise.