Why did only the last 2 visions of christmases past torture scrooge?

Well, friend, those last two visions of Christmases past may have been particularly challenging for Scrooge because they showed him moments of deep regret and sadness from his past. Seeing these painful memories helped him understand the impact of his actions and inspired him to make positive changes in his life. Sometimes, it's the toughest moments that lead us to the greatest growth and transformation.