Humanity is a quality in human, of being humane showing evidence of moral and intellectual advancement. Generally people say these words that Humanity(Insaniyat) dies, but in wider sense humanity never dies, but the Inner Soul trapped in layer of illusion in which humanity, automatically traps. It does not mean that Humanity destroyed, once you will destroy that layer of illusion Humanity comes out automatically. Many brutal people use to do humane acts, like a murderer goes and pick up the fallen old man, and many so called humane ignore such things. So Humanity is not a small term but wide.
The aim of sikh is to remove the layer of illusion from his mind and to guide inner soul about truth so to live truthful life. To live truthful life is act of humanity, to kill your inner vices is act of humanity.