with high priority cases where you know youre gonna end up going against the best lawyers money can buy, and media scrutiny, prosecutors/DA have to have all their ducks in an order to make sure they seek the right charges.
Go for too much (higher charge than necessary) defense lawyers eat that S!!! up and the defendant walks.
Thats why i think its taking so long for charges/arrests etc.
i mean if the vids/destroying evidence is true, why else would there be such a wait an NO arrests, not even the other dudes involved ?