Ding ding ding....we have a winner. I try explaining this to idiots all the time and they just look at me like what planet did you come from??
That's because people are myopic and believe that they're entitled to a refund. I explained the benefits of a pure flat income tax to a friend and he whined about losing his home mortgage and other deductions and crap.
If people do choose to get a refund, they should immediately stock it into a 401(k) or interest-earning account.