Will the solarium GOOD ending ever be cleared?

[Lantern]

4-What caused the zombie outbreak? The strange regreant in the room doesn't cause zombies yet it's labled as a dangerous pathogen. I get it USED to but now that it doesn't this doesn't make sense

There's a goddamn graveyard outside.

Yeah. Im guessing the cult has to something to do with the zombies. Not the biodome.