Why do you think that dally cant change his toughness and bitterness even though he has shown a sensitive side of his character?

Dally's toughness and bitterness are deeply rooted in his traumatic experiences and the harsh realities of his life, which have shaped his worldview. Although he has moments of sensitivity, these traits are often overshadowed by his need to protect himself from vulnerability and pain. The fear of losing those he cares about, combined with a lifetime of hardship, makes it difficult for him to fully embrace change. Ultimately, his hardened exterior serves as a defense mechanism against a world that has repeatedly let him down.