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You're getting brutal, Sark. Brutal and needlessly sadistic.
— Master Control Program ‧ Tron

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
An accusation of escalating cruelty. The speaker tells someone they have become brutal and, worse, needlessly sadistic, meaning harsh beyond any purpose. The tone is a cold reproach, judging the cruelty as excess rather than as a tool.
Context reviewed