[npipkqow] violence: the cause of, and solution to, all the world's problems

what else?  in The Simpsons, "beer".

nuclear weapons, giant meteor, and other ways of extincting humanity would also solve all the world's problems, but it's hard to make the case that that any of them cause all the world's problems.

although violent revenge ("justice") for past violence is common, violence or a cycle of violence is usually a symptom of a deeper underlying problem, perhaps resource shortage.

sex.