Define "hate speech". You never do, you merely assert that there is such a thing, that we know what it is, that it is legitimate, that it can be and probably that it should be legislated and enforced. I'm asking a serious question because we're witnessing the suppression of discussion that some groups don't like. It's an empty phrase. And in the absence of meaning, guess who decides what to classify as hate speech and thus which groups have a voice and which don't? Thrasymachus in Plato's "Republic" has an answer: the powerful.
Since we're on the subject, anti-Semitism is one of those accusations that is used liberally to attack anyone that organizations like the ADL don't like. For example, if you compare the treatment of Palestinians by the Israelis to apartheid, if you criticize Judaism in a way that resembles what Catholics are subjected to on a regular basis, or some tendency in Jewish culture, then suddenly you're an anti-Semite. Anti-Semitism is a hatred of Jewish ethnicity, a hatred of a person who is Jewish because of his ethnicity. It is not a critical stance toward questions of culture, religion, or politics. But the legitimate definition of the term has been expanded by political hucksters into what Norman Finkelstein (whose parents are survivors) calls the Holocaust industry, where a grave crime is exploited to silence criticism and bully people into silence on matters that have nothing to do with anti-Semitism. So we have a textbook example of how "hate speech" is deployed to silence political opposition and stifle debate. There are, of course, other examples.
Mind you, I do not include things like libel and calls for violence in hate speech. Those kinds of things are already legislated and penalized as they should be. Too many things, like pornography, have been falsely defended by appealing to "free speech". What I'm talking about is the use of this insidious term by powerful groups to silence those they don't like, and then pretending like that's not what's happening. It is that simple.