Downvoted I see - funny thing is how legal liability is irrelevant when your car has been pushed into an intersection resulting in your death.
You have responsibility to be aware at all times - even if it's not something you're legally responsible for, when you're in the presence of people driving multiple tons of steel at varying rates of speed, it'd be foolish to believe "but it was his fault" will prevent you from bleeding to death.
Having been hit from behind before, you're almost never at fault when you're hit from behind.
Furthermore, there is sometimes literally nothing you can do. You are not always in control, and you're going to get hit, no matter how "aware" of your surroundings you are.
