Youre referring to articles 111,112,113 of the dutch penal code, all dating from the year 1881. As with many other countries there are old laws that dont make any sense no more (the brits i.e. Have a law against wearing a harnass in the house or parliament, another one against dying there) here in holland we it is illegal to collect dry wood (it is considered poaching) or that you cannot lock intruders in your toilet till the police arrive.
While it is true that these laws should be removed the truth is that our so called officers of justice make the decision whether to prosecute in name of the state or not, and they are supposed to keep an eye on the times. As this is an archaic and stupid law, they shouldnt have prosecuted here. Not that im surprises tho, our law system is a joke (murdering a major politician gets you 10 years in jail with a state pais law degree and a headline article in a national paper.)
A king getting more protection than everyone else is not of todays world, and seems really snobby on their part. For instance it makes me think, Fuck the king.. Lets get rid of him.