Saved lives? We know that he cost some people their lives.
If you want a Google GMail account, FReepmail me.
They're going fast!
We know nothing of the sort.
All we know is that he prevented the general ruckus from metastasizing beyond New Orleans.
I think we'll find that the deaths from dehydration (if any - at most we may find that dehydration was a contributing factor to some deaths at the Convention Center) were those of the infirm and elderly who were abandoned at the Convention Center.
I highly doubt that the crowd that marched up the bridge and confronted the Gretna police included dehydrated, infirm individuals - those people had already been left to die by the crowd.