Because its incorrect. Bitcoin policy is meant for that. The Constitution does not ban hate speech and rightfully so. The Constitution protects free speech. (the consensus in Bitcoin terms) Hate speech is filtered out via peoples Culture and Values. Those are the filters. But society needs free speech. Hate speech is like a spam but you don't ban it, you don't censor it, you filter it out. You don't need 100% removal again because of freedom of speech.