And they demolished the pillar of Baal, and demolished the house of Baal, and made it a latrine to this day.
2 Kings 10:27

Even pagans have limits to what kind of defilement they will tolerate in their holy places. They'll bury the bodies of sacrificial victims and the relics of "saints" beneath the floors of their temples, but at some level, everyone knows human refuse is defiling. By turning the temple of Baal into a latrine, Jehu ensured that this place would never again be used for as a place of worship.