How many people do you think Seven killed when in service of a Fenris Ranger in person? I'm thinking around 600 to 1000 people, when she's a highly intelligent and above baseline in strength/reflexes (at a supposedly relatively elderly age).
And her victims are virtually all criminals, mercs, and paramilities (and other bad actors) so she's not a heartless killer (like PIC critics think she is), she's more a traumatised, guilt riddled person driven by an unbalanced sense of justice (and over-reactive to dangerous people).