Injustice of Noah's Curse

Following the flood and the rainbow, Genesis 9 has one final story about Noah. The patriarch gets drunk, strips naked, and passes out. One of his sons, Ham, sees Noah naked. When Noah wakes up, he utters a curse of slavery against not Ham, but one of Ham's sons, Canaan. Why is Noah's reaction so severe? And why does he curse Canaan, who did nothing? For more than two thousand years, interpreters...