Destructive thoughts and emotions undermine the very causes of peace and happiness. If you think clearly about it, it makes no sense to think you’re seeking happiness, if you do nothing to restrain angry, spiteful, and malicious thoughts and emotions.
People lucky enough to live in the vicinity of an industrial hog farm are, with each breath, made keenly aware of the cause of their declining property values.
Thus the recent rapid evolution of human intelligence is not only the cause of but also the only conceivable solution to the many serious problems that beset us.