It looks like he's another try-hard serial killer kid trying to be weird by mentioning his edgy disposition, and history with anything related to blood, whenever he can. You're not Jeffery Dahmer, Psychomutt.
It's not like nobody has ever thought about what would happen if they just murdered an infant in broad daylight, because it's an (morbidly) entertaining thought, even if it's appalling.
Kind of like when you're standing at the edge of a cliff and you think to yourself "It would be really messed up if I jumped off right here, wouldn't it?".