[Incomprehensible Nice People logic. While he often jokes about brightening people's day with his antics (and, well, he certainly has nothing against making people happy), the desire to spread cheer solely for the sake of others is beyond him. He'll just focus on the second part of what she said.]
And even in the instances where it can't, it's just so much more pleasant to face a disaster with an upbeat attitude. For all parties involved, at that. Not that I expect today to take a turn for the disastrous, but you never know.