Correct. If that were so then this human stage in our existence wouldn't be necessary. There would be no Hitlers, no famines, no crimes, etc.
Lucifer and his auxiliary wouldn't have been permitted to exist if not for a reason.
I think of our human stage as a process of character building to prepare us for the next step.
You may be correct. But I also look at the human stage as an incredible, sacred gift. And the world we occupy as nothing short of God's fantastic handiwork.