RBBM, Hiding what and from whom? This is an active murder investigation. Not releasing all their evidence is what happens to protect the integrity of their investigation.
hide 1 (hīd)
v. hid (hĭd), hid·den (hĭd′n) or hid, hid·ing, hides
v.tr.
1. To put or keep out of sight or away from notice: hid the money in a sock.
2. To prevent the disclosure or recognition of; conceal: tried to hide the facts.
3. To cut off from sight; cover up: Clouds hid the stars. See Synonyms at block.
4. To avert (one's gaze), especially in shame or grief.
v.intr.
1. To keep oneself out of sight or notice.
2. To seek refuge or respite: "no place to hide from boredom or anger or loneliness" (Matt Teague).
http://www.thefreedictionary.com/hiding
in·teg·ri·ty (ĭn-tĕg′rĭ-tē
n.
1. Steadfast adherence to a strict moral or ethical code: a leader of great integrity.
2. The state of being unimpaired; soundness: The building's integrity remained intact following the mild earthquake.
3. The quality or condition of being whole or undivided; completeness: replaced a lost book to restore the integrity of his collection.
http://www.thefreedictionary.com/integrity
JMHO the local corruption could be another reason why they are holding information/evidence close to the vest. Do not want it to have appearance of corruption. I have not seen anything that points to corruption in this case so far. Main Stream and Local Media don't appear to see it either. If there comes a time where corruption shows its ugly head, I will be on that bandwagon waving and shouting, but that has not came anywhere near so far. JMHO
No doubt that many loved MB. But those are not being vocal, local asking for updates. No media on the story keeping it out there. No one begging for updates.
On the Delphi case, I have read some and also seen some media and LEO press conf. Social Media has also impacted and messed with that case. I saw where at least 1 news agency told incorrect information and the iirc ISP had to make a statement and the news agency had to retract. Same as some of the misreporting in this murder of MB. JMHO Social Media for the good or bad is going to cause problems for all LEO cases. There has to be accountability, but putting out stupid fires of misinformation, that are once out there, are there forever help no one, least of all LEO who are tasked to find the killer/Suspect and get evidence to prosecute. JMHO