The accusations of rubber necking are largely exaggerated in my opinion.
If you are going along a busy motorway and there a big incident on the other side of the road it's totally natural to slow down a bit. There could easily be debris on the opposite cariaageway from the incident for instance.
The knock on impact of this on a busy motorway is to cause bunching of the traffic which ultimately permeates and gets worse.
So it's inevitable that it cause congestion on the other side of the road.
So chill out and don't be so self-righteous!
On the other hand the
BBC News recently had an article about screens for such instances