They can at the moment......
I think this guy has never heard of Neurology or Psychology . . .
They can study our minds right now but ofcourse in the future as technology and studies progress scientist will better understand just how mind works. In saying this, I think that their is limit to the amount that we can trully understand about our minds with somethings forever remaining a mystery. Growth ,experiences, environment and genetics all contribute to building our brain leading to huge differences among individuals and over complicates things. I guess that is what differentiates us from robots.
Can: probably. Should: I think not.