Since everything they do is conditional to the Watchtower, I'd say that they are more robotic than human.
Take for example, "wanting to die rather than accept blood". A human reaction would be to want to live, and ask for forgiveness if accepting blood is wrong.
Another example is when they go door to door. Is it normal to offer a magazine to a person that needs clothes or something to eat rather than a magazine that says how nice it will be in the new system.