I think to have such a emotional reaction at a young age is indicative of some serious mental trauma, and or neurodivergence.

But Slade is her father figure who I'm rather sure is a sociopath. Since he feels that even though he is a hired killer that has taken countless lives, and is fully cognizant of that fact, he still thinks he is a good person. Since that was all done in the name of work, so it shouldn't reflect on him as a person, disregarding the fact that he loves what it is he does for work.

So I doubt that her view on it will get straightened out anytime soon.