Most people have their sufferings. In the end, most people even die from some suffering or other. That is just a part of life

I think you skipped and interim there.

I don’t know why depression should be so different from all other diseases or troubles.

There must be a lot of things in life you don’t know. You can be dying of cancer and not be depressed and want to live on. And you can have a serious depression where you just want to die. If you can’t tell the difference between those two conditions, and why one is more detrimental to life quality than the other, I don’t see we can have anything to talk about. That level of ignorance is beyond debatable.