We need to be responsible for the things we write. You write with a certainty of a gloomy scenario, even though you can’t predict the future. Saying hopeless things like that is not only bad for your psyche, but can also inflict mental damage onto others.
Funny, I've also been lectured in the past but the other direction. I was judged guilty of being unjustifiably optimistic and giving people false hope which will only harm them in the future.