The fact is that Katrina was so powerful and frightening that many police and rescuers fled faster than Katrina's winds blew. No slam on the many brave souls who did help, and no real slam on those who ran; that's the power of nature over man.
As some people discovered, there is no power equal to nature and men can do nothing to prevent a natural disaster and little to help while it rages. All of which makes me wonder how many people prayed a little extra right before Katrina hit land, as opposed to those who figured Uncle Sam would take care of everything?
Oops, "no power equal to nature", except for God.