Why was kandata thrown to hell?

Kandata, a character from the Japanese Buddhist story "The Spider's Thread" by Ryunosuke Akutagawa, was thrown to hell because of his selfishness and criminal past. Despite having committed many sins, he had one moment of kindness when he spared a spider's life. However, when offered a chance for redemption, he ultimately failed to act selflessly, which led to his eternal punishment in hell. This story illustrates themes of morality, redemption, and the complexities of human nature.