It takes effort to look at the world through rose-coloured glasses. If it didn't, people wouldn't need to use encouraging phrases, such as, "Look on the bright side!", or, "Cheer up!"
On the other hand, observing the negative requires no effort at all. No one has to work to notice the pain of an injury, or experience the misery of losing someone to death. The feeling of sadness when hearing the nightly news about a murder or a flood or a war, that comes without invitation, without us even being conscious of its origin.
What more proof do we need that it's the optimism that is the false, enforced state? That pessimism isn't just about a dark perspective, but rather, it's about honesty and a basic acceptance of the realities of life and existence?