As much as you are absolutely correct, the problem is that most voters do not understand capital losses and depreciation either. They see DT deducting losses as somehow "cheating" on his taxes.
I think tumblindice has a point.
Trump pointed out that Hillary’s rich donors write off more than he does. That was devastating. So with the right tweet or ad he could follow through that she had slandered him about not filing taxes. Clear case of slander.
That one slipped past me.