If a bear mauls a child to death, is it being evil?
No it is being a bear.
If a child dies from cancer, is God being evil by not healing the child?
RE: If a bear mauls a child to death, is it being evil?
If one presupposes that the Christian worldview is true, then the answer I think would be that this is the CONSEQUENCE of the fall, which is the consequence of sin and evil.
The consequences of sin affect the very order of the universe itself. the Fall affects all of nature their rebellion injected disorder into all of creation.
The above of course, assumes that one accepts the Christian worldview.
One alternative, which is the atheistic worldview, for it to be consistent, is simply to say that the bear’s acts are simply what evolution has wrought.
Thus, in the Holocaust, a random configuration of atoms that evolved into what is called the Nazis simply destroyed a random configuration of atoms the evolved into what is called the Jews.