> None of your examples is what is meant by "Shouting fire in a crowded theatre."

Which is exactly the point, because they nevertheless literally are "shouting fire in a crowded theater".

> The quote with more context is clear: "The most stringent protection of free speech would not protect a man falsely shouting fire in a theatre and causing a panic..."

Which is likewise why the people trying to use the quote all but universally omit the qualifiers -- it would otherwise be clear that, even in the context of Schenck, the constraint was intended to be narrow.

And even with the qualifiers, the original quote still doesn't do well with the first example or the third, because imposing a prior restraint under the hypothetical argument that people could get confused and panic is going to be a weak case when the reason someone is doing it is it to criticize the government, and it's quite objectionable to punish people for speech when they genuinely believe something to be true just because they've made an honest mistake.