What Melvin Potter has is a great redemption story - one that fits into Matt Murdock as a lawyer. Most people look at someone who kidnaps people, attacks people, etc. and thinks they deserve to rot for the rest of their life. Way too many people still view the insanity defense as "getting off on a technicality" (when, in reality, the insanity defense is successful 1% of the time and, when it is, a defendant, on average, spends more time in custody than they would if they were convicted). With Melvin, you see a success story. He's someone who, when he has help, when he is with his therapist, he is a productive member of society and an ally of Daredevil. That trial where he was acquitted transformed him from a character who was a minor threat when a villain to one who was a tragic character when he relapsed in villainy (often because he was threatened or manipulated into doing so).