It illustrates the need for maintaining equality in a society.
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There are three very complex monsters in the poem. Grendel's mother is the symbol of Cain from the Bible. Grendel symbolizes man's sin and greed. Grendel is the monster from Hell.
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I don't know what you put
There is class inequality, like how rich people can bail themselves out of jail or are given easier bonds, for doing the same crime a poor person does.