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I, too, will defend to the death their right to do it. But man, oh man, they'd better not ask me to do them any favors.
Their right to do it extends only to not being arrested by the federal government. The Constitution doesn't protect them from owners fining them or firing them, or from fans who [correctly, IMHO] view taking the knee as disrespectful of the flag, the Constitution, and the country taking a knee with their pocketbooks and not going to games or buying NFL swag, or watching the games on television.
And taking a knee IS a violation of federal law, so you won't find me defending their [alleged] "right" to do it ... not to the death, not even to a minor ouchie. People have a "right" to rob banks, too, but that doesn't mean they can't be arrested and imprisoned for doing so.