As long as there are valid reasons to do an emergency stop, the actual reason should be irrelevant for the person driving behind. You should always assume it is

As long as there are valid reasons to do an emergency stop, the actual reason should be irrelevant for the person driving behind. You should always assume it is a child chasing their ball or something and it will be your car pushing the car that managed to properly stop into that child if you rear-end it. There just isn't a good reason to put yourself in a situation like that and it is perfectly in your power to avoid it.