Clinical depression is significantly different from terminal illness. Depression doesn't have to be a death sentence. Yes, it is immense mental, emotional, and intellectual suffering. But that doesn't mean death is the right answer, and someone who is suffering from clinical depression is not in the right frame of mind to make that distinction.

I speak as someone who has been there, is currently taking antidepressants, and has seriously considered the option at multiple times in my life. Depression will tell you there is no other method of relief from the pain, but depression lies.