I agree that the lack of ILS could be a contributing factor, not a cause. But risk management is all about probabilities. When you turn off one layer of navigational infrastructure, you have changed the risk profile of each landing, even though it is still above the minimum requirements set by FAA.

From what the pilots on this thread have been saying, 777 flight crew only get one or two opportunities to land a plane each month, and doing so by hand is perhaps even less frequent. That strikes me as a significant change in the risk of an accident.