What are the long-range effects of secure attachment on development?

The security of infant attachment is reasonably stable; later in childhood, securely attached children appear to be more socially skillful, more curious and persistent in approaching new tasks, and more mature. The effect of securely attached child is that it affects how they parent their own children.

Explanation:

Attachment to a protective caregiver helps infants to regulate their negative emotions in times of stress and distress and to explore the environment, even if it contains somewhat frightening stimuli. Child develops internal working model of  attachment - a representation of the self, attachment  figures and relationships in general which guides later  interactions with people.

no because it could make the world a terrible place to live in.