We already have more than enough information to know that BP is guilty of gross negligence (in regards to the Deepwater Horizons disaster) up to and including negligent homicide.

Whether or not that's the case, this is something that's being investigated by government agencies who have the power to order the handing over of whatever documents they need, so leaks aren't really a big issue here. (no pun intended)

But no one pays attention to information that isn't released with careful fanfare. Assange handles the media quite well, and most organizations would be better off releasing this stuff voluntarily so no one pays attention.