That was the point of Ira Glasser's stance. Him and other ACLU members defended the right of Neo-Nazis to march in Skokie, Illinois. Glasser himself and many of the other attorneys on the case were Jewish. They were protecting the rights of people demonstrating to advocate for doing violence against people like them.
Viewpoints like this are mostly gone these days in the US. Liberalism has become unpopular on the Left (and it's always been just a suggestion on the Right in my experience).
Most liberal countries have restrictions on outright hate speech. It's definitely possible to be a liberal and also oppose the right of Nazis to advocate for mass genocide.
Free Speech isn't a "liberal" or a "conservative" value, it's an American value.
The reason "hate speech" exists in European countries is because they have unresolved baggage from WWII, and rather than confront the problem, they decided to put a boot down and curtail civil liberties instead. None of that is relevant to the USA or has any bearing on our politics.
Who defines hate speech? Do you need agreement from 100% of citizens or can a few politicians decide what a country can and cannot say legally before running afoul of hate speech laws?
Who defines what constitutes murder, what food safety regulations are, or any of a million other laws? It really doesn't seem like an unsolvable problem
The word "liberal" has been mangled to the point where it is essentially meaningless. As far as I'm concerned, anyone who believes the government should have the power to regulate the content of your speech, at the point of a gun, is in no way "liberal".
There we have a case of prominent Jewish lawyers defending the right of Neo-Nazis, a group of people who advocate for violence against Jews, to protest. Here we have people suggesting we need legal restrictions around hate speech. Do you see the difference of values?
Liberalism is about guaranteeing individuals' rights in the face of the State. My point is that the Left in the US has lost interest in it and are more interested in pursuing their policies regardless of how it affects freedoms. The Right has never really cared for Liberalism and so it's falling out of favor.
Viewpoints like this are mostly gone these days in the US. Liberalism has become unpopular on the Left (and it's always been just a suggestion on the Right in my experience).