Soul-searching within the Democratic party is to be expected after its loss in the 2024 election. Donald Trump’s edge over Kamala Harris in voters’ perceptions of economic competence (perplexing though it now appears following a year of erratic policymaking) was bound to inspire a call to rethink the party platform.

Yet the second-guessing is steering the Democrats down a dangerous path to embracing a tax-cutting strategy that risks defeating the project to enable a healthier, more equitable society.

The most prominent proposal bouncing around Democratic circles comes in a bill from Chris Van Hollen, a Maryland senator.…