all of them said, I can rescue some

And everything is flawed, if you want to look at it this way. The analogy that has helped me most is this: in Hurricane Katrina, hundereds of boat-owners rescued people - single moms, toddlers, grandfathers (...). None of them said I can't rescue everyone, therefore it's futile, therefore my efforts are flawed and worthless, though that's often what people say about more abstract issues in which, nevertheless, lives, places, cultures, species, rights are at stake. They went into their fishing boats and rowboats and pirogues and all kinds of small craft (...). None of those people said, I can't rescue them all. All of them said, I can rescue some, and that's work so meaningful and important I will risk my life and defy authorities to do it. And they did. 

- Hope in the Dark, Rebecca Solnit (Foreword to the 3rd Edition, 2015)