It was in some earlier interviews that Leonard Manley and others spoke of how they were having problems settling the estates of the victims - paying off bills, etc. because they didn't have basic paperwork needed - eg birth certificates, health insurance, life insurance policies, bank account info, etc. When someone dies, all of their assets and accounts are frozen, but the bills keep coming in. It's basic stuff everyone has to go through when a relative dies. In probate court, you have to produce original documents for some of these things, not photocopies. These are not things people can "take care of" before they die. This is part of the normal legal process for dealing with someone's estate, even those who have a will, etc. Have you never helped settle an estate for a deceased loved one? I have, its a lot of paperwork.
It's not considered "accommodating" anyone. It's considered standard, ethical practice by LE, per the quote from the professor at John Jay College. But, of course, not all law enforcement agencies are ethical. In this case, there's nothing LE can't share with family WRT personal and financial legal documents. It's not needed for their investigation.
There's a sense of personal animosity on the part of LE towards all of the Rhoden family members that is inappropriate and unprofessional. As KR's daughter pointed out in the latest interview, these people weren't big time drug dealers. They were working 40-60 hrs a week in multiple jobs trying to make a living. They're the victims here, but the dead family members and their surviving family are being treated as if they're deplorable criminals.