Mi-Go's; bondage suits; brutal death around every corner; mass extinction; starvation; drugs: this is not a family friendly or strictly politically correct game. The end of the world is not a pretty place. Changing what you call your Zombie Slave does not the change the fact that you have a Zombie Slave whose desire to kill you you are taking advantage of to enslave their mindless corpseness after brutally ripping out their teeth/arms.
Yes, C:DDA is definitely no family game. Still, “creating a zombie slave” is by far the most cruel thing the player has the possibility to do. Everything else can be more or less jutified by the neccessity. Knocking out a former human being, mutilating it, not giving it a merciful death and keeping it around only for carrying your stuff is plain cruel.
C:DDA is politically correct, AFAIK; there is no racism, sexism or anything like that. What you name there are just the harsh circumstances the player has to fight, and while some of them are horrifying, that’s nothing very new, really.
The difference is, that the player himself is being so cruel, and even for a pretty minor reason. He even goes out of his way to be cruel; studies first aid, risk being attacked, for example.
Now, I don’t have a problem with the feature itself, the huge penalty to morale is probably supposed to show the cruelty of the act, but at least, we could give the act a name that indicates the reason, for why on earth you would do such a cruel thing. And that is: storage room, and not the “enslavement” of another being, just for the kick of it.
I hope I have made my point.