Why did Luke poison Thalia's tree?

Luke poisoned Thalia's tree as part of a larger plan to weaken the defenses of Camp Half-Blood and help the Titans. He believed that by destroying the tree, which served as a protective barrier for the camp, he could encourage more demigods to join his cause against the Olympian gods. Luke's actions were driven by his disillusionment with the gods and his desire for power and revenge. Ultimately, this act was a pivotal moment in the conflict between the Titans and the gods.