A deity sanctions their clerics’ actions with the gift of power, and knowledge that the cleric is spreading their message throughout the populace. If the cleric then begins to act counter to that message (particularly strongly and repeatedly), and counter to their deity’s desires, it makes zero sense that the deity would continue to sanction those actions and gift them power. It’s not something that would happen lightly for random events, but if your deity is the god of life and healing, and you torture a person for days before killing them in the slowest method possible? Yeah, I’m thinking the deity would revoke powers and have a stern conversation with their cleric. I’m not saying the DM is having the stern conversation or going on a power trip, but within the setting, yeah. It only makes sense. They wouldn’t continue to grant their power and have people misattribute the cleric’s actions to that deity’s message.