What was the good legal advice?
"Don't talk to LE,"ever,"" which was his description of his advice in the NBC interview yesterday, is NOT "good legal advice." It is a starting point, one that assumes there will be an attorney present in the overall sense who will run interference (to put it minimally and crudely), but one who will use appropriate tact and skill, as the situation unfolds, to assess the appropriate approach at any given point in time.
For a few reasons, I'm comfortable reading SB'S words and between his lines a bit. But the bottom line is that he has expressed an approach to the situation that while perhaps adequate in certain cases/milieus, here likely caused, at minimum, some sore toes and irritations that more likely harmed than helped the legal outlook for his clients, to say nothing of the life/death outcome.
As he himself said, anyone who's been to law school would advise their client not to talk to LE. However, after Day 1 of law school, it turns out there is often more to it than that.
Even putting aside the media relations (wholly secondary, imo), any attorney involved as an attorney in any complex legal situation - criminal, corporate, whatever - has to be able to see the situation - including their/clients' own relative power-level, including facts, strength, and skill - clearly. That does not mean applying a single rigid template and trying to shove the situation into it.