Reading the newspaper article posted at the above link, I see that the authorities have noticed that kitesurfing is dangerous "particularly to bystanders"; I don't think they mind so much if you hurt yourselves. So, restricting kiters from using popular/crowded beaches would make some kind of sense. Unfortunately, self-policing among kiters will only work with the responsible ones, not the d!@kheads. Nothing against kiters, hey if windsurfing involved 20m lines and giant out-of-control kites I'd expect to see it banned as well.
BTW Alez Sanz, no offense but you must be nuts, talking about getting children into kiting. What are you smoking??