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It is good in all places, as many places as possible, regardless of medium

There's a difference between including a message and getting preachy. When does it get in the way of the player experience?!

As much as I love video games, a better world matters more, so they're a bad inclusion when they're turning away more people than they're convincing/galvanizing. That's probably going to be when they're irrelevant to the actual game/story