In the early 1970s, I did travel often on BEA from LHR to BRU, on Tridents.
There were rear facing seats, often remaining empty.
Did not bother me (as I am a pilot) but regular passengers hated them.
Same thing on railroads.
I now often travel on the TGV Thalys, from Paris to Brussels.
Many seats are rear facing. They also remain empty.
I would not venture a commercial airline service with rear facing seats.
As
deltayankee mentions, would you like to get hit on the face by objects in a crash...?
xxx
Happy contrails