"A monarch acts in the interest of his or her nation, if he/she does not he/she must be removed". Er, that is the point, isn't it? Because it is exactly what happened to the Constitutional Monarchy in France. The French tried it(and not only once), it always failed because Kings don't think about the Country's interests but his, then revolution and Republic is now in DNA.

Don't argue with English about French. We are the last political correct enemy they've got and most of the times their knowledge about history is coming from Sharp or other similar books.
They tried the Polish few months ago but it is less fun...
Yesterday I heard on a Radio Station as example of oxymoron "French Military Victory"... Do you see the level?