Perhaps the enlargement of the self has also attenuated the links between the generations. Every generation has an incentive to push costs of current spending onto future generations. But no generation has done it as freely as this one. Maybe people in the past had a visceral sense of themselves as a small piece of a larger chain across the centuries. As a result, it felt viscerally wrong to privilege the current generation over the future ones, in a way it no longer does.
It’s possible, in other words, that some of the current political problems are influenced by fundamental shifts in culture, involving things as fundamental as how we appraise ourselves. Addressing them would require a more comprehensive shift in values.