I have a major issue with this part. I'm tired of the cliché that depressed people shouldn't kill themselves because "things might get better". They might actually get worse. Or they might stay the same.
I've been depressed for almost 6 years now with no sign of improvement, and it's only gotten worse over time. There's a point at which you can feel you've lost your mind. I'm not going to wait around in agony because "mental health clinicians" think it will eventually pass on it own, someday.
Beside that, depression isn't the only cause of suicide. Environmental factors can also be a big factor of what leads to depression and what psychiatry and psychology still consistently fail to address. You can stuff someone full of pills but nothing will change if they're living with abuse, poverty, unemployment, grief, etc
In general, people fail to distinguish between minor and moderate bouts of depression in the short term, and severe depression that is with you almost 24/7, 365 days a year, but that's another discussion.