Jack has the effect of allowing Roger the freedom to indulge in his fantasies. Ralph's rules and fairness where a refection of the civilised society that the boys came from and acted as a restraining influence on Roger. Jack's lack of rules and fondness for killing and violence allowed Roger to hurt and even kill people and pigs with no fear of disapproval. Roger felt free to do what ever he wanted.
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In "The Lord of Flies", Roger begins to take on Jack's traits and reacts in the ways of his leader. Although he had always had a cordial relationship with Ralph, Jack's hatred of him eventually causes Roger to hate him as well and go along with the plot to kill him.
It seems to mean that Jack's presence was drawing out the evil in Roger.
I think Roger ...
Roger and Maurice are the ones that attack Jack and Piggy because Jack wants Piggy's glasses.
Ralph does not tell Roger anything in chapter 10. Roberttold Roger that Jack was going to beat Wilfred. he told Roger that Jack had ordered Wilfred to be tied up and had then left him tied up for hours, waiting to be beaten.