Those who do business know that risks are involved.  Some ventures succeed and others fail.  The loss this article centers on was a real loss.  Of course, no one pays income taxes when their net income is negative.  The carry over of losses is an overall good thing.  A farmer who suffers through a drought one year for a net income loss, should be able to deduct those losses from the next year's income.  The calendar year means little to a farmer.  What matters is net cash flow over a longer term.  This article criticizes Trump for conducting business the way it is normally done by all involved.  When those doing business make a sustained profit, they do pay income tax.  

To cast Trump in a bad light for being a law abiding businessman only demonstrates the writer's ignorance and bias.