Numerous Internet sites, like yours, the Nizkor Project and the Ethical Spectacle, exist to answer hate speech. If ISP's comply with your request, one of two things will happen. Either hate speech will go completely underground, becoming more mysterious, attractive and powerful to its audience because forbidden. Or, what is even more likely, hate groups will simply band together to create their own ISP, providing all their foul ideas from one easily accessible menu. You will then be in the position of having to fall back to a call for government censorship.
Free speech is the cornerstone of liberty.