Paying for a parking spot isn't actually taking responsibility for doing that - how does it solve any of the problems that illegal parking causes?
Also, what exactly would taking responsibility entail? How can individuals build public transit any more than they can redesign the movie industry? Holding individuals responsible for their single car's pollution sounds like holding then responsible for their plastic straws while ignoring the impact of major corporations on pollution.
None of that sounds like taking responsibility for the impact of occupying useful land and polluting the campus air, which is what you claimed to care about.
(Even squatting on parking spaces doesn't show a lack of responsibility for the impact of parking spaces occupying land - it's a calculated use of a small amount of a resource in order to aim for more of that resource in the future. You may as well say that someone who invests their money instead of keeping it safely buried in the ground isn't being responsible with their money.)
Also, what exactly would taking responsibility entail? How can individuals build public transit any more than they can redesign the movie industry? Holding individuals responsible for their single car's pollution sounds like holding then responsible for their plastic straws while ignoring the impact of major corporations on pollution.