It’s almost always passengers going berserk, like the 24 year old who attacked another passenger and then died prior to landing or the one who kicked and bit flight crew after being denied access to the premium cabin lavatory.
Or the woman dragged off a United Express flight when she refused to put her dog in a carrier. ‘Air rage’ doesn’t even always involve the Knee Defender. But it’s usually the passengers instigating things.
And when it’s the crew, it’s the pilots. So this seemed somewhat noteworthy.