You might want to look again at when the king's power was first limited by whom and for whom.  It was not for the rights of the citizens but the wealthy landowners who were able to pose a threat to the king.

Camel's nose and all that, time passes, and look what happened in the hundreds of years since...  Gov't discovered it could bamboozle the common people into thinking gov't was good, and gov't was caring, and gov't could provide a nice teat to suck on yet still stomp on the people whenever it was needed, just so long as it smiled while so doing.

Nothing that wasn't predicted hundreds of years ago, of course.  But people that don't know history are doomed to repeat it.