He mentioned before that maybe the process for making humans good and retaining free will necessarily requires evil to exist. It's possible that by definition, suffering must exist, not that God couldn't do it. Kinda like how, by definition, you can't make a four sided triangle; it's not that God wouldn't be powerful enough to do that, it's that a triangle requires three sides by definition. Maybe the incorporation of free will requires suffering, even suffering not caused by the choices people make?