I happen to subscribe to this logic. I will often specifically choose bus seats that I think will fare better in a crash, as I feel at risk without belts. I'm surprised others don't feel the same. I'm also worried those vertical grab poles for standing passengers will become effective skull crushers in a crash.

In all seriousness, this does actually bother me every time I ride the bus. Particularly if I end up in the open row of seats right along the back.