All true, up to and including that we don't want this in our society. But, Person X has a right to have a murderous hatred of all white people. He has a right to join groups that have a murderous hatred of all white people, because the Bill of Rights guarantees us Freedom of Association. He has a right to speak against white people, because we have Freedom of Speech (granted, should he speak harmful lies about them (libel.... or slander, I never can remember which is which), or encourage violence against them, then these are exceptions to Freedom of Speech and he can be proscecuted.). Just like someone can scream about how the Zionists are responsible for 9-11 or about the black helicopters or a whole variety of other things. These are more than unfortunate--they're flat-out nasty, but they're necessary ills in a society that protects our freedom to say and think what we wish. Person X's crime is murder, not being racist. Being racist is nasty, and you're perfectly correct in that it's something we do not need and should not have in our society or any other, but it isn't and shouldn't be a crime.f X kills Y because he wants Y's money, he's guilty of murdering Y. His motive was because he wanted money.
If X kills Y because Y was white and X hates all white people, he's guilty of murdering Y. His motive was because he has a murderous hatred of all white people.
No society needs that kind of extreme prejudice.
The people who murdered James Byrd had every right to be racist. That doesn't mean that you or I would want to hang out with them, or that they're in any way decent people, but our government does not have the duty or the right to prevent this. Where they violated the law--where the government can and should step in--is when they murdered somebody.