We cannot survive without other species on the planet. As an example, if insects were removed from the Earth, humans would become extinct in less than 50 years despite all of our technology. While the removal of any apex species may not have consequences so dramatic, the loss of any species is a loss to humans and is certainly not desirable to our survival on the planet. In summary, wildlife is vital to our own existence.
Wildlife sometimes comfort people and without it, I believe humankind will be lonely. Imagine yourself in a zoo full of nothing. Some people should be ashamed of themselves every time they kill wildlife. If we keep going like this, one day, when there are no wildlife left, people might start to feel ashamed of themselves but there will be nothing we can do because what's done is done.