Originally Posted by
Batgrayson
My issue with the "I don't kill" line it's that only works when it's true, or when a hero has killed in the past and then showed remorse or at least acknowledged it. But Kara has killed in the past, and it wasn't a big deal because she was saving people. She killed Non, Parasite and White Martians. She also decided to go forward with the plan of lead-poisoning the Daxamites.
At least make her say "I just kill as a last option". It is not true, but it's better. And something similar happens with Barry: he has killed fewer people than Kara, but usually someone on his team killed the big bad and it's not a problem. Iris killed Savitar, an alternative version of his fiance.