@Dudley However, she obviously can not see into their minds, therefore she just killed him based on her "judgement". "Every single otherworlder who has POG is dangerous, and has to be eliminated" is the way of her.
@Boeya as for you, that's far apart from the meaning of the sentence. It means that the "Kagerou" guy they compared to her is a complete monster that can't be compared to her. Has nothing to do with the dead guy, whose name is not mentioned yet.
Personal Opinion : She was cool, as just a murderer. However, her happy persona makes her very hard to relate, and unlikeable. It doesn't make it any better even if she shows sympathy for the people she has killed.
LN of this manga has gotten award, the manga will start getting interesting from now on, so stay tuned! (Don't wanna spoil anything, so this is probably the best i can type here)