Please don't ask me to explain it because I don't know, but the writer/musician John Darneille of the Mountain Goats once wrote "God is present in the sweeping gestures, but the devil is in the details". I just really like it even though I'm stuck on its meaning.
Devil as details: The meat in the sandwich is a dead animal. Your mom bought it from an evil mega corp. She paid for it with wages from her soul crushing job. No one makes her a sandwich.