An article I was reading separated carry over losses from real estate loop holes. My rough summary was that carry over losses come from old tax law that intends to even out gains and losses over a longer period than the traditional 365 day reporting period and was fair in intent. They defined a loophole as a tax law that is so poorly written that one could avoid taxes that really should be paid. Their simple example of a loophole would be a person lives on rural land and in order to qualify for agricultural land for tax purposes he might plant a few fruit trees or graze a few head of livestock. While it might meet a grey area of legality, it's not really within the intent of the law. There obviously more tricky ways to manipulate the tax laws that may fall into a grey area of ethics. Trump apparently has not provided enough information to identify any of these.
If one is in the camp of trickle down economics, easing the tax burden on the wealthy so they can invest in business growth that will stimulate the national economy in some sort of multiple, a person could say that the act of following the law and paying as few taxes as possible is patriotic.