Tragic that it is, if the same two people had died in a car accident on the way to the aerodrome before the flight because perhaps one of them was doing something that he probably should not have been doing, like perhaps speeding, but we can't confirm it, it would have made the news for a day and be long forgotten.
With respect, every death on the road is fully investigated. It may make the news for a 45 second bite but the investigation will be done and findings made. The difference, it won't take 3 years.