In case nobody is understanding, Makima never killed any of them, she just brainwashed them like everyone else, she was brainwashing Denji to get him to break his contract with the chainsaw devil, which nearly worked but he realized last minute and did the hamburger and date thing with kobeni to prevent that, now Makima wants to use her army of literal simps (im not using that word lightly) to defeat him and take full control of him (remember, she had control over denji, not the chainsaw demon)