There are a number of issues in society where the optimum course for any one individual is counter to the best interests of society as a whole. Taking antibiotics is one; having your children vaccinated is another; and what we are discussing here, the arms race in lighting on roads, is another. If you view it purely from the perspective of your own best interest (we could say "selfishly", but that could be considered emotive), you'll do one thing - take antibiotics at the drop of a hat, not let your children be vaccinated, and buy, and use more often, bigger and better lights. If you view it from the perspective of society as whole, you'll think twice.
Ever since Thatcher and Reagan, we've been taught to behave selfishly, and asked to believe that this will automatically benefit society as well - but it ain't true.