Remarks commonly made when something goes wrong:
Such is life.
No one ever says THAT'S LIFE when great things happen. They're much more likely to utter something like "For once in this life something went my way!"
This should make us examine how we look at pessimists. If we all subconsciously accept that life is more tragedy than triumph, to the point where the word life is common shorthand for negativity,
we're being rather inconsistent when we reflexively accuse folks of being "glass half empty" people simply because they highlight life's non-stop struggles.
We're all legal experts when it comes to Murphy's Law. As a consequence most of us seek affirmation, which is why there are legions of calendars, greeting cards, and self-help books, to reassure us that somehow it's all gonna be okay. Seems to me the person who buys such a calendar is already admitting the pessimist's point. The pessimist doesn't need a calendar to remind him life is a downer. All he has to do is wake up in the morning.