Love is an expression and assertion of self-esteem, a response to one's own values in the person of another. One gains a profoundly personal, selfish joy from the mere existence of the person one loves. It is one's own personal, selfish happiness that one seeks, earns, and derives from love.
Love is an integral virtue i.e. love is essential for completeness of every human life/society. Oh! Yes, anyone that lacks love is incomplete & can't make positive impact in the lives of people around him/afar off.