A study, published in Nature Neuroscience, suggests the brain is very good at processing good news about the future.
However, in some people, anything negative is practically ignored - with them retaining a positive world view...
When the news [in the test] was positive, all people had more activity in the brain's frontal lobes, which are associated with processing errors. With negative information, the most optimistic people had the least activity in the frontal lobes, while the least optimistic had the most.
It suggests the brain is picking and choosing which evidence to listen to.
They also say 80% of people are optimists so I guess the majority of the population really are sheep who simply ignore bad news or potential problems until they are stampeded by events. Not only does that explain why we hear of only a few people actually doing anything in preparation for PO but also why no argument or facts presented seem to have any effect on our few corny-trolls here, let alone the wider populace.
http://www.bbc.co.uk/news/health-15214080