Venom chose Eddie Brock because it empathized with his "loser" status and eventually turned against its own kind to protect Earth, ultimately deciding to work with Eddie as a vigilante, despite its confused sense of morality.
Here's a more detailed explanation:
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Shared Loser Status: Venom, like Eddie, was an outcast. The symbiote was deemed unworthy by its own kind. This shared feeling of inadequacy and rejection created a bond between them. Venom saw in Eddie a kindred spirit.
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Empathy and a Change of Heart: Initially, Venom's intentions were aligned with the hive mind, but exposure to Eddie and his experiences began to change the symbiote. It started to develop empathy for Earth and its inhabitants, something foreign to the rest of its species. This empathy was crucial in its decision to betray its own kind.
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Rebellion Against the Hive Mind: Venom's empathy led it to oppose the planned invasion of Earth by other symbiotes. This rebellion was a direct result of its connection with Eddie Brock.
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Vigilante Partnership: Venom's decision to stay on Earth and protect it wasn't solely altruistic. It still craved a host, and it found a compatible partner in Eddie. They agreed to work together as a vigilante, targeting "bad people," though the symbiote's understanding of good and evil was somewhat skewed and influenced by Eddie. This partnership was a compromise between Venom's inherent predatory nature and its growing sense of responsibility.
In summary, Venom chose Eddie Brock because of a unique combination of shared circumstances, growing empathy, and a desire to rebel against its own kind, forging an unlikely and often chaotic partnership for vigilantism.