I guess I didn't picture your context of the Youngs in regard to seeking out the camera for interviews, etc. I'm sure during those first few days, the media was clammoring (sp?) for any type of comment or interview(s) from them. For them to give a little comment, asking for the public's help in finding the murderer, or to give an update as to how Cassidy or Jason were holding up, etc....would be acceptable. Emphasizing, they could make statements and be seen as showing compassion and care and concern...and grief...without mentioning details of the crime or Jason's alibi or actions, etc.
IMO, that was missing. Not like they have to do such things, but when the public gets wrapped up in caring about a case, they want to hear how key players are doing, etc. And I think that was the point back to the silence from this legal firm. It's just quiet compared to so many cases, and somewhat different than the firm's normal "PR" actions, maybe. (You know the saying, the best offense is a good defense, etc.) People just wonder why, as it's noticeably different.
JMO.