They don't say it, they don't even acknowledge it themselves, but they view this in the same way a credulous middle ages individual would view making a deal with the fey. The right set of words, the right incantation, will grant you power over them whether they want to acknowledge it or not.

That's the mental image they have. If you ask them how these secret laws are enforced and what actually obligates the judges, police, government, etc to follow the rules, they won't admit the magical thinking, though they will babble and make up nonsense that sounds, to them, like genuine explanations but is in truth gibberish.

At the end, though, that's what they're doing...they're chanting mystical incantations that will bind the Queen of the Faeries to their will and prevent the fae from doing harm upon them or impeding them.

But they don't even take the cautionary parts of the tales to heart, for even if you should succeed on pulling one over on the Faeries, they are wily and patient, and someday they will trick you into giving up the protection you thought was unbreakable. Just as even if they actually managed to stumble upon the correct legal maneuver, it is likely the system will be back to get them one way or another.