They weren’t people, they’d told him over and over. They were windup dolls. They didn’t live.
Accelerator wasn’t supposed to defeat them. He was supposed to kill them, or none of this would actually work.
It made him be creative. He had to find something to enjoy in all this, solving a problem differently, in a new way, with a new application of his power. He hurt people who deserved it to find some taste for the damage he was going to inflict, leaned into the adrenaline rush each time.
He spoke to them before each experiment, tested the theory again, and time and again, they failed to respond because they weren’t people.
So this wasn’t cold-blooded murder.