source: Because the owner tends to be unaware, these computers are metaphorically compared to zombies.
target: Usually the owner doesn't know about this. Their computer is compared to a zombie.
references: Usually the owner doesn't know about this. Their computer is compared to a zombie. The computers are compared to zombies because their owners are unaware. The owner is unaware. The computers are compared to zombies. Because the owner is usually unaware, these computers are metaphorically compared to zombies. The owner is unaware.  Therefore, these computers are like zombies. These computers are compared to zombies because the owner is mainly unaware. Because the owner usually doesn't know, these computers can be called zombies. These computers are like zombies because their owners don't know what's going on. Because the owner tends to be unaware, these computers are fasely compared to zombies. The computers are compared to zombies with the owner not knowing.