I have a different theory on why people jump into gaps: they're bored. Traffic jams are really dull, and the illusion of progress is much more entertaining. So

I have a different theory on why people jump into gaps: they're bored. Traffic jams are really dull, and the illusion of progress is much more entertaining. So not really greed. And it's more ignorance/self-centeredness than short-sightedness; they haven't thought of the jam as a systemic problem to which they're contributing.