So, with a lot of Worm characters we don't get much of their backstories. Especially, it seems, when those characters probably had really interesting triggers that completely inform the kind of person they are by the time they appear in story.
Hatchetface is a prime example of this. He's a serial killer that specifically targets Brute capes and only joined the Slaughterhouse 9 because they'd give him more opportunities to kill capes. To my knowledge there's no mention of him taking part in killing normals until the S9K event. He could have, but I like to think he only did when his buttons were pushed by Jack.
Because Hatchetface is someone who hates Parahumans. He's a Brute and a Trump. Meaning he had trauma caused by a Cape, physical trauma that completely wrecked his face and likely other parts of his body. A cape attacked him in some way, brutalized him, made him feel like an utter weakling despite being the massive, muscular man that he was, Maybe even murdering his family in front of him.
And in the end, Hatchetface became a nightmare for Capes, a thief of their powers, who makes them feel exactly as weak as he did the day he triggered. But he remains his own fear, trapped, plagued by a self-hatred he will never overcome.
Maybe that's why Cherish chose him to kill. Playing on his self-hatred, dragging up suicidal thoughts he likely had. Until he ended it.
But even his peace in death was stolen from him by a cape. More than once.
