Other reasons are more self-serving and have to do with our own survival as a species. That is, personally . Obviously we ignore, or forget, or fail to notice that we are dependent and interconnected in the whole world of beings, biotic and abiotic. When one species is at risk, we are at risk too. That our well-being is diminished by the extinguishment of a poor little bird is neither a hysterical nor a fringe notion.
Ignorance is no excuse.
Our reality is spelled out by many - elders of traditional wisdom, professors of western rational science, and spiritual leaders who comprehend our fragile human existence in time and space. Maybe, if all the marbled murrelets in the world dropped dead out of the skies in one moment at my feet, I would know something was up. More likely, if all the marbled murrelets disappear forever, they will do so in silence. I won't even know, or notice. But, I would be culpable, and I would be less as a human being, whether I knew it or not.