Hatred is emotional root to love

I have read the KVRR's thread on hatred is always barrier one's happiness. In some areas, it will not be worked. For example, a nation who is ready to fight against other country by putting soldiers at the borders. Can we call it hatred causes the people of the nation lacks mental piece. According to me, every emotion in human life is needed to enjoy the life of beauty. Value of love can be known and realize if and only if there is hatred. For example, at one moment a lover who is hated by his love mate. That is possible if and only there is love in the hearts of lovers. But, it should be understood that hate is guide to the emotion of love. Do you agree with me in this aspect? Please tell me the reasons why it is possible or impossible.