Why did Lawton have a change of heart toward Harvey Birch?

Lawton had a change of heart toward Harvey Birch due to a growing recognition of Birch's integrity and loyalty, despite his initial suspicions and hostility. As events unfolded, Lawton came to see Birch's true character and the sacrifices he made for others, which ultimately led him to appreciate Birch as a person rather than merely an enemy. This shift in perspective highlighted themes of redemption and the complexity of human relationships in the face of conflict.