So you're on a dual carriageway that's a very busy, major road and you see a pedestrian at thw side of the road. He hasn't started to cross yet - what do you do? Get slower and slower as you approach him until you're 6 feet away and finally stop???
Of course you don't. You slow down, sure. But if you're still doing 45mph (which is pretty damn slow for a road like this) and he steps off the pavement at the very last second, like when you're 5 yards away, then you're going to hit him, and hit him hard. Looks like this chap hit his head right through the screen of the car too. Even at 45, that's pretty likely to kill him.
Let's turn it around, Milly - if you're a pedestrian and you see a really busy, fast road with an underpass, what's your preference of how to get across? If it's to cross the road, then perhaps natural selection will carry on as it has always done.
Apart form all this, none of us are in possession of all the facts about what happened. I don't know WHO was to fault - it really doeesn't concern me. But what I was trying to say was that we shouldn't jump to conclusions just because the driver was 80, just as we hate it when we see the driver of a fast car accused of being in the wrong just because of the car he/she was driving.