re: Piers Morgan accused of racism for criticising Simone Biles.

The media will NEVER admit they play a role in creating the massive pressure athletes face through their hype propaganda. Still, if you're expected to be the very best in the world you have to expect that at some point you'll not be that anymore. Athletes have been dealing with this forever.
This declaration of resigning for "mental health reasons" is simply afraid of being embarrassed on the national or international stage.
Finish it out good or bad, and if you have to back off your routine because you're afraid you'll hurt yourself just do it and live with it.