We have limited knowledge, or else science and philosophy would not be necessary.

If intelligence is the ability to adapt to change, then wisdom is to know how and why to adapt for more than personal or economic gain.

Why should humans in their unsurity decide what species are and are not important to humans? Is nature's characteristic ability to naturally select species not the most perfect decision maker we humans have access to on this issue? Just as we expect human children to respect their human elders, let us humans collectively respect our significant elder--Nature.