unconditional positive regard

why is unconditional love or positive regard so beneficial to a person?why is it so important to be wanted or to be loved?for example, in psychology it is believe by some researchers that it is important to show unconditional positive regard to a person going through a mental disorder. does this make the person feel important and cared for?for me, this unconditional positive regard helps me unconsciously develop my identity. when anyone praises you, you feel a sense of pride. and this adds a new tag to your existing identity. for example, if you saved a person from a fatal accident on the road, and you were praised for your bravery, it can make you think that you are a brave person. therefore, you are adding the tag of bravery to your identity.people who have mental disorders, feel good when their family and friends show unconditional love towards them because it helps develop their identity. it shows them that they are more than what they think they are. it develops their sense of their identity. and when this happens they tend to feel better as it makes them feel more like a "normal" person rather than a patient and the psychiatric institution. it makes them feel like they are part of the outer world rather than the world that is created for them. even when you see a poor boy playing an instrument on the road for money, if you praise him for his music, he will feel good and this adds the tag of a musician to his identity. so, this basically helps develop his identity and his self confidence.