But natural evil is a by-product of natural laws. And natural laws probably are a necessity in a world suited to free-willed agents
No it isn't.
Any intelligent deity could design a world without tsunamis.
IMHO natural evil is a necessity in a world of free-willed agents.
Natural evil and free-will are unconnected. That is why natural evil is an irrefutable objection to christian theism, and the sort of evil that results from the things free-willed agents to others isn't.