Was This DM Wrong For Not Letting A PC Come Back To Life?

It’s so refreshing to get to hear both sides of a conflict. In my opinion the DM didn’t properly articulate the lethality of this campaign. I wasn’t there but from the world setting and the rarity of diamonds I would imagine player death’s would be pretty rare or the DM would have told them to bring a stack of character sheets because this is going to be a meat grinder. But I am glad that the DM recognized that they didn’t do a good enough job explaining the world and allowing the player...