Human progress to a more empathical and overall better society has been constant. At first empathy was reserved only for members of one family and tribe. Then empathy expanded towards people of same nationality and religion. As long of circle of empathy expands to encompass more and more things, we'll be fine.
I won't say there haven't been some really dark blemishes on history, but in spite of all that humanity as a whole moved on.
Humans make mistakes. A lot of mistakes. It comes with the turf.
As for coping, try reading some Terry Pratchet and embrace the ancient philosophy of Discworld - Things happen, what the heck.