Humans inherited sinfulness, or a damaged nature, or tendency to yield to Satan's temptations from Adam and Eve, who committed the original sin against God.
Wrongdoing results from God-given free will plus a weak side, or a drive to satisfy personal needs, which sometimes results in wrongful choices (and/or vulnerability to Satan's temptations).
Ignorance of one's true existence as pure spirit and as one with the Universal Truth (or soul, mind, etc.) can lead to wrongdoing.
Not listening to the voice of God, who resides within all, can lead to wrongdoing.
Egoism (self-importance) leads to desire, craving, and attachments, which can lead to unwholesome thoughts and behavior, i.e., greed, hate, and violence.
No supernatural or spiritual reasons. Human nature, psychology, sociology, criminology, etc., explain wrongdoing. Or not sure. Or not important.
None of the above.