Shane had this notion about guns. A gun is as good or as bad as the man using it.” What is the interpretation of Shane’s philosophy about a man and his gun? (explain his philosophy, how does Shane live according to this principle)

I think there is a double meaning here. There is the skill part of how good a gun is related to the man (the man using it). The statement also relates to the morality of the gun being shot. It is the person who decides if it a worty cause or not.