Well anyways, my point is I think that the death note can be used in a way. That the death note itself cannot control, and that is why the plot contradicts itself.
Another example is, you see if light could had gotten the names of those FBI agents, he could had simply gotten more names of the FBI agents, and those FBI agents could had gotten more names of police officers or FIB agents.
and soon he could even had made himself the only law enforcement in the world.