Unless you're living on the street and surviving on a diet of discarded turkey drumsticks there's no point in being gloomy. We've spent too long trying to cheer ourselves up by spending money on brightly coloured things we don't really need. We've stopped using our imaginations.
There is so much of good in human nature that men grow to like each other upon better acquaintance and this points to another way in which we may strive to promote the peace of the world.