He was probably not the first person they harassed. He wouldn't be killing them, no. He'd only be lessening the sufferings in the world and the City.
The only reason why he didn't kill them right now was because he knew that it could backfire on him.
"You want to tell me why you targeted me," Atlan commanded.
And just like that, the guy spilled the whole truth. Someone named Otis Orioness commanded them to teach him a lesson.
Orioness. Obek is also from the Orioness family…are they related? Probably…they want revenge for his death.
It was no secret that Atlan and Obek clashed heads during the race. Not only that, Atlan was the very reason why Obek was overwhelmed by the horde of Pseudo Canzers. If Atlan hadn't shot off the blinders in Obek's mount, he could have escaped with his mount.
Otis targeted him for that.