I wish to strongly second your observation that focusing on the worst case results in one steering towards the worst case and leads to rumination which results

I wish to strongly second your observation that focusing on the worst case results in one steering towards the worst case and leads to rumination which results or at least worsens depression. And acceptance of reality as it is seems to he roughly the antidote. The below is dangerous for some minds. "By keeping the very worst that can happen in our heads constantly, the Stoics tell us, we immunise ourselves from the dangers of too much so-called ‘positive thinking’"