They aren't. But people treat them like they are. I do care about people using constitutions as if they were moral documents. I'd be just as annoyed if someone used a constitution to defend something like freedom of press or freedom of speech. I don't care about what the particular issue is: its the citing constitutions like they prescribes perfect morals that I care about.

Its fine for it to be hard to change. My issue is people treating them as if they perfect moral documents in arguments.