And that's why we have ICAO.
IATA is an airline trade association. It certainly lobbies other organisations to improve/enhance ATC, Security and national regulators, but it does focus on things directly under the control of the airlines such as CFIT.
I would imagine IATA's medical people are devoting their efforts to address psycho issues, but this is only partly under their control. Best practices will be shared, but national regulations will prevail. .