How do Scrooge’s earlier words come back to haunt him?

Words that later come back to haunt Scrooge are as follows:

“If they would rather die,” said Scrooge, “they had better do it, and decrease the surplus population.”

"Are there no prisons? Are there no workhouses?"

When Scrooge expresses his concern for Tiny Tim, the ghost informs him that Tiny Tim will die unless something changes. He then uses Scrooge’s own words about “decreasing the surplus population” against him.

When Scrooge is presented with two more sick children, his own words come back to haunt him again.... “Are there no prisons, no workhouses?”