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As long as one's own choices don't have any detrimental effect on others, I'm with wezie and CES.

However, say the guy did broach his vessel and ended up clinging to a marker in the inlet. Somebody has to go save his arse and that puts others in danger. Not to mention fact he was playing around in navigable channel. Obviously he wasn't by himself out there as there was at least one PWC and likely others outside the inlet that will eventually come in. Maneuvering like that there in those conditions is a good way to cause a collision.