thinking about that Frank's and Matt's argument scene in DDBA again because it's so deliberate the way Matt is picking that fight, planting all the little mines (you could be of service, i forgot you're the victim in all of this) to pick a fight with him - and then you can even see Frank's helpless agitation when Matt just turns around like he's about to leave just when he's got him all worked up - bc that's now how that goes with Frank, you can't just start a confrontation and then walk out (not to mention that I think Frank is pretty lonely at this point and this is some much needed social contact for him and all).
So he has to get out the big guns (figuratively) and make this about Foggy and Dex.
Is this about Matt looking for "permission" I'm not sure - but who else is going to yell at blind lawyer Matt Murdock for losing his friend in a tragic crime, who else is going to hold him responsible for not protecting his own. I definitely think it's also about the pain of knowing that Foggy is dead and Dex is stil out there, alive every day in the same world as Matt (as Frank says) but I also think it's about Matt's guilt, about being Daredevil but still failing to protect the people he cares about - and if no one knows he's Daredevil, all he ever receives is sympathy and condolences and compassion which is the opposite of what he feels he deserves. So he goes to the guy who's beating himself up over the same thing every day of his life because he can count on him to well...punish him.
