It is assumed that the collective conscience of society will ultimately make the right decision. Having faith in humanity means having faith that society as a whole will do the right thing.

-MM

I believe it means believing that humanity is ultimately good. That people are not born evil, but as clean slates and that deep down every person wants the same basics things and is driven by the same need for happiness and love. Further more, it means that the wars and horrific events that took place in the history of humanity do not prove that humans are essentially bad, but rather that they are affected by their environment, poverty and brainwash and that these horrible events will not repeat themselves. Having faith means that humans will learn from their past mistakes and will use that knowledge in creating a Utopian society that is free of racism and hatred.

That basically most humans are good and will come through in a time of need.

faith in humanity comes from someone in the public eye doing something very nice and noble… Especially if they are in government…