Which particular failing of man resulted in the building of the ark?

The particular failing of man that resulted in the building of the ark was widespread wickedness and moral corruption. According to the biblical account in Genesis, humanity had become exceedingly evil, with thoughts and intentions focused on wrongdoing. God's grief over this pervasive sinfulness led Him to decide to cleanse the earth with a flood, instructing Noah to build the ark to save his family and pairs of each animal species. This act underscored the consequences of human disobedience and the need for divine judgment.