This is right on the mark. It is fine to be a doomer & probably necessary that we have such. However, human beings are readily influenced and when they hear something often enough, they tend to accept it.
Continually hearing a negative message eventually leads to apathy because what is absorbed, over time, is 'there's nothing to be done -' just wait for the worst & hope I'm not around when it happens.' - Indeed, what happens is that the warnings of disaster become expectations of disaster. In effect, they become a part of its cause.
Children *are* influenced by what they perceive, hear and are taught. If doom is the continual message, then doom it will be. I don't, for a second, suggest that we lie to children or anyone. At the same time, honest portrayal of the reality is necessary but needs to be accompanied by advice as to how such eventualities can be avoided or changed. Positive messages inculcate that - they provide the courage, determination, & strength to think, investigate, advocate and take action. They promote the leaders.
Whilst I feel that I understand and concur with the doomer narrative, the one lifeline to hope that I have is the positivity that those who, realistically because they have alternatives, offer a different outcome.
So, yes, I accept the need for doomers, for they sound the warning. However, continuing to sound the warning when the fort has already had its walls overcome is nothing more than sensationalist heroics.
I need and strongly desire more of those who will offer solutions that prevent over-run and collapse in an honest and attainable way. I also strongly believe that much more of such is what humanity needs to hear.