Regarding snowkiting. It's a completelly different story there. Snowkiters would never go into the slopes where the people that pay for liftpasses ride. It just wouldn't make sense kiting in the slopes. They seek big open areas where they can play around, like Silvaplana Lake in Switzerland, and most of Norway

It's the same with skiing though. Everyone in the slopes/pistes have to take it easy. I've skied for 22 years, done 4 seasons and several times been stoped by the "liftwaffe" and pisteurs for riding, in their opinion, recklessly or too fast. As soon as you're outside the designated skiing area they don't give a toss, you're on your own. But inside their areas, your ass is theirs.
It's the exact same thing with kiting. Lifesavers and even the council have duty to make the time spent on the beach for the public as safe as practically possible. If kiters, surfers or poleys breach this and jeopordizes people safety I'm pretty sure they do have the right to put an end to it. People kiting at busy beaches, endangering other people, are pushing the envelope. If we kite at woodies, the authorities wouldn't give a ****. We are in a "people-free" area and less likely to injure anyone. You never hear reports about complaints from Woodies or remote beaches up north and down south.
Everyone just needs to stay way clear of the swimming areas not to aggitate any unknowing swimmers. I'm sure I've been "close" to swimmers a couple of times too, me knowing it is safe and I have full control over the situation it's not always the swimmers know that, more likely never.
I also know it's hard when we have alot of tourists/euros coming here for a month or two, not caring about rules and/or staying clear. They just want to have a good time, show off and enjoy our fabulous conditions, which of course backfires on us long after they have gone home.