OP is kind of like answering the question . . . "What is the difference between a duck" . . . . . Ans: "The front leg of both is the same!"
That has the semblance of a question, in a grammatically-minimal form. But it's kind of meaningless as it stands, because it doesn't have an object. We don't know what the 'Why?' refers to. In natural-language conversation, sentences consisting only of the word 'Why?' often occur and typically are understood as meaningful, but that's because the inquiry occurs in the context of a larger conversation in which the object of the question is already understood. That looks like a non-sequitur. It doesn't have any context either. Presumably it has something to do with the original word 'Why?' But without an object, at best (and that's not very good) it's just an expression of generalized alienation and anti-social feelings without any purpose or direction. One reason why people with psychiatric illness often speak incomprehensibly is that their words are generated in very peculiar internal contexts that are known only to themselves, and not to any of their listeners.