Om Swami
Which actions are wrong or tamasic, and when does an action not bring sin?
Tamasic action versus rightful duty
An action done out of delusion, or one that binds you and has violence, harm or destruction in it, is tamasic (of the dark, dull quality). A soldier who kills an enemy soldier while his country defends itself is doing his appointed, natural duty, and it brings no sin.
An action done out of attachment, or one that binds you, in which there is violence, harm or destruction, is a tamasic action.