I understand the autopsy Holder ordered was done by the Us Military and completed Monday.....which likely showed Holder some facts possibly yet missing....and why he's going to Ferguson to speak with the “Police Officials” there to see what they have as facts from the happening.
Interesting they did not mention Holder meeting with the Protesters at all. So I'll assume at this point he's there to see the facts from the event and confer with the authorities only.
....might be also trying to determine how to present what they know without further outcry from the protesters because they are not in the mood for facts that might disagree with what they really want....Wilson's arrest.
Right now, the regime thinks they are stirring the base with no consequences to what white vote they have left. If Holder is seen with protesters, the political fallout would be disastrous. Remember what was happening in America when Nixon was elected in 1968?