It's under clear attack, but is not yet nullified. I already touched on this but the examples you cite are exactly where it's doing what it is mean to; the clear illegality of these things is something people can recognize, and courts still have power. As an American, I'll say that this is the only civic principle with any sort of universal recognition that matters, and it is the biggest thing holding the country back from collapse. What else do we have? Surely not a sense that human beings should be treated with care and respect. If freedom of speech ceases to exist, so does the United States; we must never let it go.