[unknown_apostle]

Consider hypnotics used during light medical procedures to keep you awake but compliant. From a state of more freedom you can freely choose to enter a state of arguably less freedom. Why would this be a contradiction?

> Edit: Also the definition of "mental illness" is somewhat nebulous and not historically fixed. Homosexuality was at one point called a mental illness.

Yep, insights and definitions of illness will keep changing. But while insights in the details of e.g. psychosis may vary, few would deny a correlation with chemical issues.