George is forced by sympathy and guilt to care for Lennie. ""Because I got you to look after me-" (14) It is disgusting and out of place for George to hear about Curly's Vaseline-filled glove. He finds it improper to be speaking of that, and George discards it as a comment of a lesser individual. At the end of the novel, George is forced to mature, and to move on with his life. He takes a gun in his left hand and shoots Lennie, his other half. Without hesitation, he turned away and "walked up to the highway" the next step after maturing. He knew that he had to kill his animalistic side to prosper and to live life. Lennie only served as a hindrance, and through a trial, George overcame an obstacle. With the humanistic side, one of values, manners, and intelligence, there is a side of carelessness, obstruction and defiance. .
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Animals act based upon instinct and their ideas to surviv. They think on a low level and do not observe consequences, nor remember them. Lennie is a character Steinbeck used to portray the aggressive, greedy, malevolent features of human beings. "Behind him, walked his opposite, a huge man, shapeless of face, with large, pale eyes, with wide, sloping shoulders; and he walked heavily, dragging his feet, the way a bear drags his paws. His arms did not swing at his sides, but hung loosely"(2) Lennie "dipped his whole head under, then sat up on the bank and dripped down his blue coat"(3) Steinbeck uses these descriptions to prove how much Lennie compare to a wild animal. He acts like a tiger that has been thrown a steak. He doesn't remember the things George tells him, which also cause problems. George repeatedly orders Lennie to leave the mice alone, but insisting, he does not comply and causes tension between both sides. Lennie has a one track mind. He only thinks about what his desires are. He wanted ketchup on his beans, and argued about it, he wants to tend the rabbits, and whenever he does something wrong, he's not worried about correcting the mistake, but only if George will let him tend the rabbits.