Young white leftist women self-report the highest rates of mental illness of any political demographic - both in the US and in Western Europe. And bear in mind that these are self-reported rates - the actual rates are probably even higher. Leftism is a mental disease.
I think it's lower. Many are not mentally ill. They're just weak.
Modern people often self-diagnose normal feelings of sadness, anxiety or frustration as a "mental health issue."
And normal events (e.g., waiting in line, someone disagrees with you, you're rejected after a job interview) often cause their sadness, anxiety or frustration. Which they interpret as mental illness.