See also post #15 (hotlink) for thought provoking issues, as there remains some serious questions regarding environmental contributing issues.
More serious and questioning science is needed to determine 'cause and effect'.
I feel for the athletes. Many of them are young and they've worked so hard to develop their bodies and minds. From a distance, it does seem the sane thing would be not to attend the Olympics. Instead, they'll rationalize that they can avoid infection. Denial always kicks in when one is too close to the threat.