It's really quite simple. The proximate cause was the way that the car was being driven. It can be simultaneously true that something else can be the reason that the manner of driving seemed necessary. It's perfectly rational to attribute her death to that indirect cause, in this case the behaviour of the media. It's a bit like blaming the former president for the Covid deaths on his watch. He clearly didn't personally infect the people with the disease, but his inaction created the conditions in which they did. Of course, the media didn't force the driver to drive the way he did, he could have driven like a little old lady on the way to church on Sunday, but he didn't, he drove like someone seeking to escape from perceived danger. Just because you don't see the link or accept the the validity of their assessment doesn't make the princes' attribution of blame to the media irrational.