Again: I don’t think it’s a weak VA, really. His “nonchalance” is the defensive mechanism of a not terribly bright person dealing with almost incomprehensibly bad news. A huge part of my job is giving normal people really bad news; they do not react with wailing and gnashing of teeth. They react kind of like Simon. “Wow, that’s fucked up man. So what’s for dinner?” The enormity hits them later, but the game doesn’t last long enough for that. We only really begin to see it creep in in the final lines, after Simon launches the Ark.