Roll away rig kills two

How awful I'm sure the neglectful trucker must be sick,knowing his error in judgment cause those 2 deaths.
Other then neglecting to set the parking brakes,I don't know any other way an unoccupied Semi would roll away?
 
Drivers that are so NEGLIGENT or "in a hurry" in not RELEASING THE BRAKES on Trucks and/or Combos when parked up, DESERVE ALL THEIR REWARDS.
 
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