I don't believe you ever go to New Orleans then or you would know different. Mardi Gras is one month out of the year... New Orleans has lots to offer and tourism is big year round. Cajun cuisine, jazz music, etc... there's much to see and do in and around nola.
My statement was that there was only one arrest because the people there acted very civilized for 300,000 drunk people in such tight quarters (you were literally surrounded on all sides, everyone was pressed up against each other). The people there just know how to have a good time without resorting to such stupidity that leads to riots. Plain and simple. Not something we can say about philly, chicago, seattle, L.A., and New York (all recent rioting events). There would have been riots in the street with looting, raping, murder, anything a mob mentality brings on.
Spock was wrong, btw... lots of animals war with and feed off each other... course spock didn't have the Discovery Channel...