Great artists are sometimes unaware of the deepest meanings in their own creations. Though Dickens might not have recognized it, the primary moral of A Christmas Carol is that there should be no limit on IRA contributions. This is quite independent of all the other reasons why the tax system should encourage saving (e.g., the salutary effects on economic growth).
If Christmas is the season of selflessness, then surely one of the great symbols of Christmas should be Ebenezer Scrooge—the old Scrooge, not the reformed one. It's taxes, not misers, that need reforming.