@2: Most of it was humour, indicating excessive paranoia. Under that was basically a mix of being humble (might have reasons we would never think of to do it), and the implication that it's not only bad but so bad every little trace of probability must be pushed as close as possible to 0.
From Mike Darwn's Chronopause, an essay titled "Would You Like Another Plate of This?", discussing people's attitudes to life:
Conclusion, graphs, and references in article. As usual, I recommend reading Chronopause.com as Darwin has many good articles; to quickly link a few: