Now that is simply not true. Who trashes cartridges at shows are idiot attendees who should NOT be touching gear to start with, especially tone arms. No exhibiter I know of allows or wants attendees to cue a record.
Also, I know more people who have xx2's or higher on WTL's who never trash their cartridges..... And one I know of has Parkinson's.. Perhaps it's the damping goo that helps slow any possible problems down...