Howard Zinn has written a powerful essay called The Optimism Of Uncertainty, which I think will be loved by y'all:
In this awful world where the efforts of caring people often pale in comparison to what is done by those who have power, how do I manage to stay involved and seemingly happy?
I am totally confident not that the world will get better, but that we should not give up the game before all the cards have been played.
The metaphor is deliberate; life is a gamble. Not to play is to foreclose any chance of winning. To play, to act, is to create at least a possibility of changing the world.
Read more here