It's a strange sort of "cherished American tradition" that is so subtle that I, as a native American more than a half-century old, have never even heard of it being a tradition before.
Yes Americans have cherished a very liberal/free definition of free speech rights.
Absolutely. That wasn't what I was questioning. What I'm questioning is the proposition that wishing death on people is a "cherished American tradition". I don't think it is.
The American tradition is to be very permissive about how far speech can go before it becomes illegal. That's a very different thing.