Please Help Me Understand this...why not?

You're the Republican nominee for leader of the free world. You've been a successful businessman, make untold amounts of money yearly based on work you did before you retired. For over a generation people running for national office or appointment to cabinet positions made public their tax returns for many years as a way of being open no matter what questions arise from publicizing the returns. Now less than 100 days from the election you are hounded to publicize more than one year's returns. You make the argument that you have met the law's reporting requirements but still the questions come. You argue if the public knew, the Dems would attack them ... making people wonder even more what may be in there. The question here is, nominee, WHY NOT PUBLICIZE THE RETURNS and take a issue from the Dems? Help me understand... why NOT?