Well “it’s human nature” can indeed be a cop out. It shouldn’t be a discussion ender. And it shouldn’t be a justification. Murder is a part of human nature too. However it is a reality to be worked with. And one can ask, in what conditions is this behavior brought out, and in what conditions discouraged?
You realize the world is full of people and organizations with many different opinions and interests, don’t you? It is impossible for anyone to do anything, or fail to do anything without people being unhappy and critical about it. The bigger and more powerful you are the louder that will be. There should be nothing surprising about this.