What is the "right" choice?

In the article the author asks, how do we determine in the first place which is the "right" choice? He asks this question when talking about free will and whether it exists. This is a very good point because if we are truly free, not predetermined, then the chances that we will not make the "right" decision is great. We can use our knowledge of the world to make our decisions but knowing that we make these decisions purely of our own volition makes us question whether we made the right choice or not. Some people just have really bad luck. Is this because the world decided that they would be unlucky or are they making the wrong decisions. A determinist would say that all the events up until that moment determined that that person would be unlucky. A free will believer would say that the person simply made bad choices. There is no way in either belief system to fully know if we made the "right" choice. We as humans and not knowing fully whether we are determined or if we have free will simply must trust our minds to make the choices or to trust that the plan determined for us will not lead us astray.