Given that a lot of resources during Katrina would not have existed in the 60s, this could see a much larger death toll.
I'm not sure how bad or good race relations where at the time, but a white dominated police department with racial issues might not be as willing to help some of the black neighborhoods. This would only compound the problem.
That being said, by this time if the police did something so stupid as to compound the fallout of a disaster, if New Orleans survives and rebuilds, I could see the NOPD being gutted and rebuilt from the top down, and maybe wiping out a lot of the more corrupt elements in the department. Long term, that could actually turn out to be a good thing.