If a vehicle is approaching you head on, isn’t it much safer to assume they aren’t turning? You’ll usually be wrong, but if you are right it could avoid a head on collision
Which results in a dead motorcyclist.
- Assuming the light is properly indicated but in this failure mode the motorcyclist turns. You collide and the motorcyclist faces serious injuries or dies.
- Assuming the light isn't properly indicating intention, you slow down, and cars behind you might also slow down. No one injured.
There is clearly one option that is significantly safer, even if the probability is low.