[quote=@rush99999]
I have a question about the Humanity mechanic.

How does becoming too detached result in a game over? I can understand that too much mental trauma can be just as dangerous as too much physical trauma. And I can definitely understand that too much stress can lead to people doing dumb stuff to escape it. But losing all empathy for or faith in the human species and starting to see other people as 'just meat'? I don't see how that could be bad enough to make a character unplayable.
[/quote]

So, when you experience a Break - when you max out a Humanity threat - it's not that you sit down and spend the rest of your day in the lunatic asylum. You become "That Guy" in the zombie movie - the guy who fucks it all up for everyone. Think the guy who goes crazy, sees his wife in the horde so he opens the gate and the zombies flood the enclave, or the scientist who keeps zombies chained up as pets and starts feeding humans to them. 

You don't necessarily "go crazy", you just cross the line from protagonist to antagonist. You become a threat. Where you Break, your character does something that ruins everybody's day and may or may not die - maybe they get rent asunder by the zombie they can no longer bring themselves to kill, or the other Takers see the monster you've become and shoot you down. The character might survive to become an antagonist later on - run off to make a cannibal cult say - but in a tabletop game that means they functionally stop being a player character and become an NPC.

For someone broken on Detachment, think the Governor in Walking Dead. Breaking on detachment might look like the scene where he guns down his own men and the survivors defect.