The deeper problem facing the United States is how to provide meaningful work and good wages for the tens of millions of truck drivers, accountants, factory workers and office clerks whose jobs will disappear in coming years because of robots, driverless vehicles and “machine learning” systems. The political debate needs to engage the taboo topic of guaranteeing economic security to families — through a universal basic income, or a greatly expanded earned-income tax credit, or a 1930s-style plan for public-works employment. Ranting about bad trade deals won’t begin to address the problem. The “automation bomb” could destroy 45 percent of the work activities currently performed in the United States, representing about $2 trillion in annual wages, according to a study last year by the consulting firm McKinsey & Co. We’ve seen only the beginning of this change, they warned. Currently, only 5 percent of occupations can be entirely automated, but 60 percent of occupations could soon see machines doing 30 percent or more of the work.