I think mental illness only affects the weak
I think only the weak are affected by mental illnesses such as depression and anxiety. As society as a whole gets progressively weaker and less independent, mental illness rates are rising. I used to be depressed and then I realised that the problem was me, so I stopped being so weak minded and improved myself. Modern people seem so reluctant to take responsibility for their own faults and always want to blame their illnesses.
The vast majority mental illness is simply a case of weak mindedness. Strong emotions such as extreme sadness, grief or empathy are only felt by the weak and you can train yourself to not feel those things anymore. People wonder why their pills and drugs don't help them when they're refusing to try to fix themselves.