I fear the lack of them. A subtle thought that is in error may yet give rise to fruitful inquiry that can establish truths of great value. If my doctor told me I had only six minutes to live, I wouldn't brood. I'd type a little faster. Life is pleasant.
Death is peaceful.
It's the transition that's troublesome. I am the beneficiary of a lucky break in the genetic sweepstakes. It is change, continuing change, inevitable change, that is the dominant factor in society today. No sensible decision can be made any longer without taking into account not only the world as it is, but the world as it will be. Never let your sense of morals get in the way of doing what's right.