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Roger edged past the chief, only just avoiding pushing him with his shoulder. The yelling ceased, and Samneric lay looking up in quiet terror. Roger advanced upon them as one wielding a nameless authority. (11.231)
Elected officials can get voted out of office; autocratic rulers get forced out of office—and they're lucky if they survive. When Roger just barely avoids pushing Jack, we get the feeling that there's another power showdown on the way, and it's not going to be pretty.
Her bows [were] hauled up and held by two ratings. In the stern sheets another rating held a sub-machine gun. (12.211)
The desire for power and the taking of power by violent means is not limited to the island.