Some psychologists claim that, in theory, the best way to understand another person would be through deep empathy, whereby one would gain a direct and complete grasp of that person’s motivations.
Conclusion (thus)
These psychologists are wrong. i.e. Deep empathy is not the best way to understand another person.
Intermediate Conclusion
Suppose they are right -- suppose that deep empathy, whereby you gain direct and complete grasp of someone else's motivations, is the best way to understand another person -- There would be no way at all to achieve understanding.
Evidence (since)
It's psychologically impossible to gain a direct and complete grasp of another person's motivations.
But one can understand other people.
Evaluate
The author is attempting to refute a position by demonstrating that a logical implication of that position is wrong. It's kind of like arguing by a contrapositive. You say,
That sort of argument isn't flawed if we accept its two premises. Do we accept the two premises here?
.
The 1st premise seems to contain a shaky move. The author is thinking,
That seems to contain a flawed assumption that
I could say, Clearly that's an impossible plan. Does that then mean that Of course not.
Goal
The move to the final conclusion is logically valid (if we accept all the ingredients of the author's "implications of their logic" rebuttal), so we can really only complain about the move the author made to reach her intermediate conclusion, which is saying that the psychologists' position entails the notion that .
Essentially, this author is acting like