Fate of the Man of God from Judah

An old prophet of Bethel lies to the man of God from Judah, only to lead him to disobey God's command and to die as a result. The man of God is killed for disobedience, while the old prophet lives on and eventually even benefits from the death (2 Kgs 23:18). Why did God punish his prophet who was deceived, not the one who deceived? The text keeps silent about this as well as about the motive of th...