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The virtue of testing, certification, and solid design goes well beyond "signalling", when an expert in the field raises their concern.
"virtue signaling" is a mean-nothing phrase
But most people confuse virtue signaling (attempting to fit in by saying the right things) with moral grandstanding (garnering attention)[0]. Which behavior Cameron is engaging here is for the reader to judge.
No, that makes you a tourist. If someone falls off an observation platform I'm sure you are qualified to offer some insight.
James Cameron is a legitimate submariner. He is in a more exclusive club than the astronauts who walked on the moon.