Free will explains murder. It does not explain earthquakes
The objection
The free will defense covers evil that people do. It says nothing about the enormous share of suffering nobody chose: tsunamis, birth defects, childhood leukemia, famine, a bacterium that eats a face. No human freedom is protected by a fault line. If God set up the physical world, then the physical world's cruelty is his design decision, and the most emotionally devastating suffering in human history falls entirely outside the answer that is supposed to cover it.
The response
This is the strongest single objection on the page, and no reply to it is comfortable. Three are usually offered and each is partial. The first is that a world with stable laws is a precondition for any free action at all — you cannot make a promise or build a house in a world where physical regularities bend to keep everyone safe — and stable laws that make agriculture possible are the same laws that make earthquakes. That has force, and it does not explain why these particular laws, with these particular casualties. The second is theological rather than philosophical: Scripture treats the whole created order as damaged rather than as functioning correctly, groaning is Paul's word, so natural disaster is presented as part of the wreck rather than part of the design. Whether a reader finds that persuasive depends on much else. The third is simply that we may not know, and that not knowing is a real position rather than a defeat. Where this lands: the free will defense does not cover natural evil, this page does not pretend it does, and the remaining answers are weaker than the one it replaced.