We know that congresscritters depend on spending promises to get elected. The democrats could easily rewrite the tax code to simply eliminate nearly every deduction except for a rather high personal deduction and make the entire thing fit on less than 5 pages, but they will never do that because it's too easy and takes away one of their most used tools, the ability to craft legislation benefitting their wealthy donors. And I do have to wonder why the left always has a fit about defense spending when it's explicitly required in the Constitution while social spending is not.1) The reason why democrats push for more tax legislation is because it counters republican legislation cutting revenue.
2) Republicans don’t do this lol. They cut revenue but don’t actually cut the spending necessary to even balance it out. You do know republicans love defense spending right? That’s why the deficit blows up under republicans.