I wish everyone was as sensitive to violence.
Great job on opposing views by the way Desert Girl.
Since many people have said their opinion on this I will too.
I feel that, between feeling pessimistic and optimistic, is being realistic.
I think that this optimism/pessimism lens that you choose to see the world through predisposes you to think and by extension, to do certain things.
I prefer to be realistic, and to not dwell on the the past, things out of my control or the future, with the exception of planning and reflection.
Hope is something I choose not to have.
Here is a quote I like for this situation:
"Dr. King once said that the arc of the moral universe is long but it bends towards justice. It bends towards justice, but here is the thing: it does not bend on its own. It bends because each of us in our own ways put our hand on that arc and we bend it in the direction of justice...."
Personally I'm not a fan of the word justice, but nothing is perfect.

I don't think that for as long as humans live there will be genocide, or for that matter animal exploitation. As long as this "civilisation" maintains some sort of shared knowledge, I believe it will eventually come around like it did with sexism and racism.