Because the event has been previewed day after day minute detail by the media
Previewed? The only information given was the route taken by the courtege, the order of service and some names of those attending/taking part. You didn't watch the funeral so you have no idea what the funeral was like.
It was beautiful and extremely dignified, as were all but a mere dozen at most of the crowds lining the streets. There were thousands in the crowds by the way.