Cynicism wins the day because negative outcomes are easier to plan for than positive outcomes. Humans defaulting to optimistic outcomes of the future often end up littering the ground with externalities that they failed to consider. And we also only have a single model for infinite growth (cancer) that always leads to destruction, so relentless optimism as a biological organism means a need for infinite growth, which we only know to be a path to destruction.

The answer, therefore, is not bitching on the internet about all the wet blankets who only see negative outcomes, but acknowledging that everything we know needs to end eventually including ourselves, and balancing optimism for the short term with cynicism for the long term. And thus discovering that a healthy cynicism for the future predictions is probably appropriate, unless you truly want to live forever and have infinite energy for everything. But that's a god.