 What seems to be the Scorpion's motivation?
CALL HIM NEMESIS By DONALD E. WESTLAKE Criminals, beware; the Scorpion is on your trail! One of the others took the pistol away from Mister Anderson, the guard, and said to him in a low voice, "Think about retirement, my friend." The third one, who carried a black satchel like a doctor's bag, walked quickly around behind the teller's counter and started filling it with money. The man who had first spoken herded the tellers, Mr. Featherhall and the customers all over against the back wall, while the second man stayed next to Mr. Anderson and the door. She fell unconscious to the floor, and all three of them ran out of the bank to the car out front, in which sat a very nervous-looking fourth man, gunning the engine. Then, after the getaway car had gone more than two blocks, it suddenly started jouncing around. "What I can't figure out," said Stevenson, "is exactly what made those tires do that. Except that in the trunk lid the owner had burned in 'The Scorpion' in big black letters you could see half a block away." "If I'm making just a quick stop—I never spend more than five minutes with any one customer—I always leave the keys in the car. "It was four professional criminals, I thought you knew that. Stevenson followed Hastings' pointing finger, and saw again the crudely-lettered words, "The Scorpion" burned black into the paint of the trunk lid.
 They hate criminals and work as a vigilante, punishing people as they see fit.
 They want people to know their name and fear them, hence leaving their mark at every crime.  They are indiscriminately attacking people in various situations.  They hate criminals and work as a vigilante, punishing people as they see fit.  They want to cause trouble because they are actually The Scorpions, a group of juvenile delinquents.