because it leads to the denial of the principle of non-contradiction
>Most tyrants tend to insist that their causes are objectively right and accuse their opponents of relativism. Shallow people like you help them out.
The point is that without any truth or moral good above the will of man there is NOTHING for the weak to appeal to in the face of the strong. When the strong man is crushing the weak man under his boot, all the weak man can appeal to is: law, justice, truth. But if all law, justice, truth is the invention of the will, then the law, justice, and truth of the strongest will dominates that of the weak, so there is absolutely nothing to appeal to above the tyrant.
This is Orwell's point in 1984. He says that "freedom is being able to say that 2 + 2 = 4", i.e. freedom is being able to acknowledge that their is an objective truth / reality independent of man's mind. If there is no such truth, then man is the sole inventor of truth, in which case the State becomes the determiner of what is true and false, right and wrong, good and evil.
Or, as the rapper Hopsin puts it: "if God doesn't exist, then the government is God."
Nietzsche is an extreme moral relativist/nihilist in the formal/metaphysical sense. His advocacy of "passion" or "will" or whatever is based totally on his own preference / poetic instinct, and he admits it.
>To live largely and dangerously and gloriously and passionately and do it all without dogmatic moral codes making you second guess yourself.
See, this is what dumb adolescents read into Nietzsche. They think that Nietzsche's triumphant individualism will allow them to climb mountains and half sex with girls. OK, maybe for you that's what it will be, because you are a bourgeois liberal in the 21st century. But in other places or in other people, Nietzsche's moral relativism means being able to kill whomever you want, rape whomever you want, enslave whomever you want. Because you're a "nice guy" this new moral "freedom" means "living life to the fullest" or some banal shit like that, but to a person less nice than you it means being able to stamp on whoever they feel like.
> I was trying to live as a half-assed Christian, but I found the self denial aspect just wasn't compatible with my constitution. I was limiting myself by acting against my natural inclinations, because I was afraid of devolving into hedonism. I was also excessively polite and overly generous, which I was realizing stemmed from cowardice rather than goodness.
This is called over-reacting. You admit yourself that you were a half-assed Christian. Your timidity did not come from your Christianity, but from your lukewarmness. Christianity does not advocate cowardice, you can see this simply by reading the lives of the saints and seeing what superhuman feats they did. Self-denial doesn't mean being shy around girls, it means heroic self-sacrifice to the point of death for the love of God and humanity.