Your initial instincts were correct. Riders pulling in the clutch to rev the engine loud are being foolish. It's a completely useless safety precaution, and wastes critical moments that should be used to avoid whatever the actual risk is. Pulling the bike out of gear to make noise takes away one of the tools that can actually be used to save yourself - immediate acceleration in a direction that could help. Even if the plan is emergency braking rather than swerving or accelerating, worrying about revving the engine simultaneously will mean the rider will perform that emergency brake that much worse than they would have otherwise.
Bottomline, it's a dumb habit done out of impatience and anger - not safety.
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