Where do you live that politicians aren't constantly trying to remove welfare benefits?
Look at the tax reform debate now: When they proposed taking away deductibility of mortgage interest or state and local taxes deductions, I started seeing headlines from the New York Times and Washington Post about how this a “Middle Class Tax Hike”...
I would compare UBI to the "second system syndrome" with software developers: If only we can start over with an entirely new platform rather than addressing the technical debt in the current system, all would be well.