Why does James apologize to Kate in the miracle worker?

In "The Miracle Worker," James apologizes to Kate because he initially expresses frustration over her unwavering support for Helen, their deaf and blind daughter. He feels that Kate's devotion to Helen is misplaced and that it's detrimental to the family's well-being. Recognizing his harshness, he seeks to mend their relationship and acknowledge the challenges they all face, showing his understanding and compassion for both Kate and Helen’s struggles.