Drivers expect other drivers to follow the rules of the road, not to be nice.
Did you hear about the woman in Canada [1] who tried to "be nice" and stopped in the middle of a highway to let some ducks cross? She killed a motorcyclist and his passenger.
Don't be nice -- be predictable.
Same is the reason why the bots get rear-ended -- everyone expects them to roll through a stop, who in the world does a complete, 3 second stop?
[1] https://www.google.ca/search?q=Quebec+woman+stopped+for+duck...