HELPP Read the excerpt from part 2 of "Flowers for Algernon."

And I had been laughing at him too.
Suddenly, I was furious at myself and all those who were smirking at him. I jumped up and shouted, "Shut up! Leave him alone! It's not his fault he can't understand! He can't help what he is! But for God's sake . . . he's still a human being!"

How does Charlie’s realization about the dishwasher affect the plot?

It causes him to defend the boy.
It causes him to scold the boy.
It causes him to help the boy clean.
It causes him to mock the boy.