It is well put, but in it lie the seeds of its own illogic. It makes no sense to seek a judge who will use a tool to temper his bias; instead you must seek a judge who recognizes that he is susceptible to bias but is capable of judging by using that part of his mind that is without bias. If you have ever served on a jury, you were asked to do the same thing, and I hope you did it. You may well want a judge with broad experience, or a good imagination, so that he can understand things of which he has no direct experience, but the very last quality you should look for in a judge is empathy. Empathy is an emotional response, and if you want justice uniformly applied, inviting emotional responses to real cases is no way to get it.
It is of interest that the subject of this skein has become "right wing codewords." It is Mr. Obama who has chosen to establish "empathy" as the hallmark of a good judge. Not knowledge, or wisdom, or honesty, or respect for the rule of law, or even "judicial temperament," the king of buzzwords, but empathy. He began using it on the campaign trail and so, from my perspective, empathy is very much a left wing codeword.
Finally, think of it in selfish terms. Bear in mind that Mr. Justice Souter is not the only one whose view from the bench has proved out to be not quite "as advertised." If you have gone to the trouble of electing representatives to write laws that you want written, and if you have gone to the trouble of electing executives who craft regulations that you want enforced, why in the world would you want to APPOINT FOR LIFE someone who is inclined to undo all that, take your representation away from you, because he has more empathy for the other guys?