Very true, but the NOPD damn near has a copyright on it. These stories are nothing new. During a visit to the Big Easy over 20 years ago, I recall one cop holding up a liquor store and killing another off-duty cop/security guard in the process. Hundreds of cops on the force had felony records. The NOPD, like the city and the state are hopelessly corrupt and like any corrupt organization that relies on graft, intimidation, and deception to exist, they are completely incapable of preforming in a real emergency. (See the Democrat Party)
My impression of the New Orleans cops is that they had one primary mission -- protect the tourist areas and attractions so that the bucks kept rolling in. The rest of the city was little better, if any, than Nuevo Laredo.
Undoubtedly there were crooked cops in New Orleans. Heck, the whole city and state government is corrupt. It's an institution.
Sadly, I think the real story isn't so much that cops looted, raped, and ran off the job. It's that the majority stayed on and did the best they could in a horrible situation.