No, I think differently
You say...
"...When disaster strikes, people tend to take the every man for themselves mentality..."
I prefer to believe Mr. Enns. He lived in Amsterdam when bombs fell, and buildings crumbled.
He told me that people just came with whatever they had, wheelbarrows, shovels, and the like, and dug for survivors, and cleaned up.
I said I couldn't imagine complete strangers in my city doing that.
He said that was the way he thought before the bombing...but it wasn't true.
When disaster struck people just pitched in, maybe because they liked their town better the way it was before.
The people of Holland starved during WW II. In the streets, people of all ages just slipped to the pavement and died.
As the Germans were pushed back and began to lose, a day of truce was declared. Our armed forces provided food, and the Germans distributed it.
My uncle was there. He fought for nearly five years, non-stop, in Italy, then in Holland and Belgium.
The people helped each other.