I don't think you're right in some ways. People can be taught to have control over their feelings and reactions. It depends on who is teaching you. An expert in that area  can teach you how you can get over any kind of bad feelings that you don't want. It's being done and this is not something new, unless you have not experienced or seen it before. But one thing I know for sure is that it can be done.

I don't really think that there is anything that can't be taught in trading. You can be taught how to trade, the technical analysis and you can as well be taught the psychological side of it. We are having experts these days hence finding a right people to teach us is not a big problem. This is the reason people are becoming too lazy to learn anything by themselves and going for classes for every aspect of trading and life.