They’re little sea puppies that are perfectly happy to cruise around while you swim with them. At least that’s the grey nurse sharks we get in aus. The ones you’re describing sound more like wobbegongs or similar. The grey nurses need to be in highly oxygenated water.
Grey nurses also used to have a rep as “man eaters” but that was just because of how they looked,not any actual attacks
It won’t win anyone to your side if you’re trying to convince them and say that though. That’ll just harden them in their views.
If you really want to reduce the influence of the right then you’d want to stop that sort of language spreading