Probably you need to add the factor of accidents. Not only do they kill people, they are also the major reason for blocking traffic.
Why is it sad if it turns out a subset of people are already behaving in a way that analysis indicates promotes better flow?
Because aggressive driving is dangerous? Perhaps aggressive driving also contributes negatively to the overall flow in the real world when not everyone drives equally aggressive (i.e. through extra lane switches caused). But I don't know much about traffic analysis so idk.