What central argument does wiesel present in this speech? explain citing details from the text

In his speech "The Perils of Indifference", he wants us to know that when someone is indifferent to the suffering of another he/she is just as guilty as the person causing the suffering. When we stand idly by and do nothing we become accomplices to a crime against other human beings. Wiesel's speech emphasizes that this is how evil takes hold. We are all in this together, and we must stand up to evil wherever it exists.

The narrator was a bit disappointed the way Mrs. Croft coldly bid goodbye to him.

This reveals that the narrator was attached to Mrs. Croft and this is why her cold goodbye disappointed him.

Explanation:

"Interpreter of Maladies" is a collection of short stories written by Jhumpa Lahiri. The last story in the collection titled "The Third and the Final Continent" is a story of an Indian man who left his country to study and work in North America.

The narrator shifted to Mrs. Croft house on rent and spend six weeks there before moving out.  In these six weeks, he became affectionate towards her, especially after knowing her age– 103 years. So, when Mrs. Croft simply said "Goodbye, then!" and shut the door behind the narrator, without saying anything else, he was disappointed.

He got disappointed with her goodbye because he has become attached to her and expected some warm goodbye.