Here's the issue. It's NOT their back yard. They have a public beach adjoining their property line, and they are unlawfully trying to lay claim to the land between their property line and the sea.
An analogous situation would be a property owner deploying security onto the public sidewalk fronting his property and deciding who could or could not walk there.
Not only that...but most of these celebrities fought for politicians and issues that would make sure that it wasn't their back yard.