A good leader will seek to optimize the environment for the benefit of the system he leads. Back then he was leading a business, hence he was optimizing environment for that business. And he was very good at that job.
Now he is seeking to lead USA and from his past leadership record we can assume he will do as good a job as he did in his previous leadership roles.
The little fact that makes his position perfectly coherent and credible is that what is good for a particular business is not necessarily good for the country as a whole.
People who see contradiction in his positions while in different roles have a mistaken idea that the two kinds of optimizations are one and the same. They are not. It is like while having a girlfriend A promising not to sleep with woman B. That doesn't contradict possibility of splitting later with girlfriend A, becoming a boyfriend of woman B and then sleeping with her. For some reason the Trump haters are perplexed by such scenarios.
Or in trumps case: being married to woman A (with whom he had children), then cheat on her with woman B, then divorce woman A and marry woman B (with whom he had children), then cheat on her with woman C, then divorce woman B and marry woman D. Just like that!
Any man who cheats on his wife especially once children are in the picture is utterly and completely morally bankrupt...thank goodness the Donald did it TWICE!