Why did basil make an attempt to destroy the painting?

Basil attempted to destroy the painting because he was horrified by the influence it had on Dorian Gray and the corrupting effect it seemed to have on his soul. The portrait served as a mirror to Dorian's moral degradation, and Basil believed that by destroying it, he could save Dorian from his hedonistic lifestyle and reclaim his friend’s humanity. Additionally, Basil felt a deep sense of responsibility for the painting, as it represented not only his artistic talent but also the darker aspects of Dorian's character.