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Say, "YIPPEE!" I'm only working because my boss of 30 years is winding down his practice and I will not leave him to someone else at this late date. He's been very good to me and I will help him until the last box in his office is packed.
(Rights rights)
The Merriam citing you show above specifically references the phrase civil rights movement, not merely the word rights, therefore, it does not address in any way, shape or form what you wrote. Also, the citing has nothing to do with the context of the sentence you wrote: you capitalized a word in the middle of the sentence, an action for which absolutely no context exists.
If you choose to cite a source or use it to bolster your point, it would help to use one that matches what you’re defending.
Long story short: Rights rights.
The fact that people wrote something incorrectly, or often wrote something incorrectly, does not suddenly nor automatically make it correct. Using your new attempt at justifying what you wrote incorrectly in the first place, it makes perfect sense to capitalize the word Constitutional, and at the discretion of the writer, the word Rights, the latter of which I stress is discretionary. However, it is by no means a hard and fast rule that referring to anything that is Constitutional can always or often be capitalized.
Now the twisted knickers are in your court.
WelbyQuentin 