We, the humans, are willfully causing pain and suffering to others through our actions, and whilst this may be true to a certain degree, we cannot conclude as to why this is until we have fully analyzed the question. What is "cruel"? everyone has their own ideas, some some see it as mistreatment of animals, others greed and desire, though in whole, they are all simply the by-product of a motive that lives in each and every one of us, not just humans. Let us consider the following scenario: Why does a Lion kill a baby Antelope? it has its reasons, to feed, to deliberately target the weak and vulnerable to heighten the chances of self-gain, sound familiar? the actions of humans can indeed come across as cruel, but as to why they are done there could be any number of plausible explanations, the only thing we know for sure is that actions are done for a purpose, normally to benefit another through someone else's suffering, but hey, the world was never made of sugar, it strengthens and develops itself in any way it needs to, survival of the fittest. For this reason, I disagree with the topic that humans are unnecessarily cruel.