For humans, hurting other humans is bad. Why would one presume the same applies to the creator of all things? Because God created all things, including all laws of absolute morality, everything he does is right and good. Not just causing harm but doing pretty much anything to humans is entirely within the authority of the creator of humans, since humans exist to fulfill the purpose of their creator (similar to how a programmer's program is created to fulfill the programmer's will).
Hurting other humans is wrong in most cases for other humans because we lack the authority. The Creator, by definition has that authority, not just to hurt but to cause all the good experiences of life.
That said, hurting people is not the same as evil. An Almighty creator who knows all and exists beyond the constraints of time and space has no need to resort to evil.
The Christian God I believe in , chooses to have good will and purpose towards humans even though he has the authority to not do so, because of his unchanging good character. Bad things happen to everyone, that is what justice is for. in it's time God will make all wrong right.
If you believe an almighty God who only does things people like and cannot prevent bad things from happenning,then you don't really believe in the almighty and all knowing part in my opinion.