Ok, so we are human beings and emotions are part of who we are as a species. With that said though, yes it is true that we can't allow emotions to rule our decisions completely and we have to balance it out with logic as well.
I think you are wrong to say that the US is a business and that a businessman should lead it. It probably has become a business now but it wasn't always that way and it shouldn't stay that way. The US is a country and it should be lead by someone who can be respected as a leader. A businessman especially one who has avoided military service has no business being commander in chief of our armed forces, one of the presidents biggest responsibilities. Can you imagine what that would be like? The president has to be more than just a businessman, because making this country great isn't just about money. It's also about dealing with domestic and all of the world's problems because we have made our country the example that is to be followed by the rest of the world. We are the world's policeman whether its because we feel that it is our moral obligation or simply because we have interests abroad. We have to simultaneously take care of our problems here in the US which include things such as health care, racism, immigration, etc as well as all the other b.s. that is going on outside of our country and thats just how things are when you are a superpower. So running the US cannot just be like running a business because there's more at stake here. This isn't just a problem for Trump, Carson also has this problem. He's a well known surgeon but that doesn't mean that he is a great candidate for president either.
As far as his solutions go, well for example say there is this one guy I hate and i can't stand him being around me. Some people will just deal with it while i say you know what i have a solution. Ill just kill him, and once he is gone so is my problem. That's a solution right? Does that mean it's a right one though? People say I like him because he is direct and speaks his mind, well i'm sorry but speaking your mind doesn't mean just say shit of the top of your head. There is something called tact and our president, our leader, better fucking have that and a whole list of other characteristics that make one a good leader and someone i would be willing to follow. Trump is a joke and is caught up in all these silly antics. This is the guy that is running for president? How does this reflect the state of our country? I bet Putin is laughing his ass off and everybody else is like wtf seriously?
In the end I think people fail to recognize that the President while a very important man has limited power and it is the people in congress who really run this country. Yup all those fat cats up there who serve a four year term and get a pension afterwards. Its these people that we have to watch more closely. A president can make a thousand promises but he will only be able to keep a few just because if congress says no then he can't do shit unless he wants try an overstep congress in which case it will be seen as him having too much power and being very dangerous.