Of reason’s many deaths is panic one.
But everybody’s got tools to right the ship when things start tilting. Running is the wrong play for them, sure, but the response to that for a DK would be D&D and Death Grips.
While we’re ranting, though, I’d like to call out every single actual spud that tries to reestablish threat on a boss with every button but taunt when someone rips aggro with their damage. It puts pressure on the healers to keep them up, it forces them to use defensives when they otherwise wouldn’t have to, and if they die it makes the fight take that much longer. It’s a dumb waste of everybody’s time, including their own.