Based on textual evidence in Chapters 11 and 12, how are Jack and Roger similar?

In Chapter Eleven, Ralph becoidlmes increasingly frustrated with the lack of cohesion and descension of the boys on the island. Like Jack, he begins to get angry, call out harsh orders, demand obedience, and call names. He fights with Jack, thus, breaking his own rules, and after Piggy's death, he runs like the wind to get away.

The two boys, however, do remain very different. Ralph is appalled and guilt ridden over Piggy's death, he never considers murder the answer to a question.... Ralph remains civilized, albeit, a less civilized version of himself in reaction to the events around him.