Love is present everywhere. It is the intelligent who keep the love from being distorted. Love when distorted becomes greed, jealousy, fear and hatred.
When a person is involved– it gives rise to moha – obsession. Anger comes out of love for perfection.
Behind every emotion, positive and negative, there is love. There is no existence without love. We want love, pure love without misery, which brings joy and peace. Pure love turns into bliss. The spiritual path keeps the love away from greed and puts you on the other side - bliss and joy. This is the usefulness of these practices.