The flood hit many folks so fast they didn't have time to find their shoes.
No doubt you and I would have volunteered to commandeer unused cheap tennis shoes under the circumstance wouldn't we? Or, would you let those people go shoeless?
Bet the other posters I've identified would.
You have a good point about some needed shoes. However, Watching the video, the Reporter asks the Police Officer, what are you doing? She said, she was doing her job. He said, taking shoes, she said NO, looking for looters. So if they were collecting shoes for people why didn't the Police Officer state that?