Read into it? You referred to 'screwing over many people with a net gain' as a 'talent.' A talent you think we should have in our corner.
If you do not believe it is permissible to cheat people for profit, what does make you think of this as a talent?
Yes, much like a car thief that quickly steals in the night ... over and over many times ... perfecting his skills throughout the years. A talent or skill can be used for good purposes. Example 1) a reformed car thief using his experience to help out a stranded motorist who locked her keys in the car. Example 2) a former hacker assisting authorities with cyber crime.
If Trump is as skillful as he professes, that he has or even continues to harm others for his own personal gain in no way guarantees that he would not set out to benefit the US in his foreign trade deals crafted to benefit the US both for the short and long term.
There may not always be honor among thieves, but cicumstances can often have a strong sway on who will do what to whom. There are those that would steal from anyone, and even if the ole saying, "once a thief, always a thief" is true, some can be quite selective. To illustrate, it would not surprise me to learn that an art thief would chastise a teen from stealing novelties from his friends parents. There are small time criminals that would steal your toilet paper if left to their own devices, but then there are those that will embrace the role of helping others even when there are selective circumstances for looking out for themselves underhandedly.
If you show me that he has harmed others, then you've given me reason to take pause, but you have not shown that a full blown stop is in order. If he takes on the role of a leader of a nation, then I expect him to bring his skills to bear on doing what's right for the nation he'll take pride in making greater than it is. Yes, a watchful eye is in order when he stands to personally profit with enormity, but it's going to take more than a financially immoral track record of acting for personal gain before it can be cast as being more than serving as mere reason for doubts for how he would utilize his crafted art for the benefit of his home country.