I have aways liked the description of a humanist outlook as one based on evidence, reason and compassion. The compassion is particularly important because, as humans, we need more than just to know the world. We also need a way of relating to each other and to other species. I think that compassion is an inherent quality of humanity – and probably of many other species.
Compassion is not dependent on specific political, religious or philosophical beliefs. In fact, a world view that argued otherwise would, by definition, not be compassionate. How could you be compassionate if you deny this attitude to other humans?