No matter how successful this response, it can only explain evil caused by human free will. It does not explain any catastrophic horror that has nothing to do with human choices. Think of earthquakes, floods, and disease—so-called 'natural evil' or 'acts of God'. We cannot confront a paralyzed, demented, and blind Tay-Sachs child and his despondent parents and then chalk up the entire wretched scenario to free will. No one chose it. Healing that child wouldn't tread on anyone's freedom. At its best, the value of free will is relevant to, and can only excuse God for, a mere portion of the evil we find. Whether of not we call that 'evil', we must stick with the evil that we humans freely create—so-called 'moral evil'.
But there is another, similar problem. Some instances of moral evil already involve violations of free will—e.g., rape. For God to step in and deny the violator his freedom would also be to protect the victim's freedom. In such cases, it all comes down to whose free will is more valuable—which instance of coercion would be worse? And it is morally implausible that the best thing to do is to respect a rapist's freedom to rape unhindered rather than protecting the victim's freedom. So, for a large category of moral evil—all moral evil involving coercion—it's automatically implausible that the value of free will can justify God's inaction. We must then narrow the domain of admissible evil yet again.
With the candidate evil suitably restricted, we can ask: Is God off the hook? Many say no. Some deny the existence of free will, and so can dismiss the entire proposal as mere fiction. Compatibilists sometimes attack the essential premise that God cannot influence our choices without thereby cancelling our freedom. After all, compatibilists believe that determinism is consistent with human freedom. And if determinism can allow for freedom, perhaps so can appropriate divine meddling with our decisions. The upshot of these challenges is that, to absolve God, we need a reason to think that he really couldn't influence our choices without cancelling our freedom. The customary theistic appeal is to a libertarian conception of free will, but such a conception is under heavy fire from its rivals.
Another challenge focuses on different ways to interfere with freedom. One way is to 'jump in' and take control of the agent, dictating its every movement and thought. This is the kind of coercion we envision in mad scientist stories. But it might also be the kind of coercion that motivates our above intuition that if God got involved, we'd all be 'robots'. We should remember that there are other, softer kinds of coercion. Look to policemen and jailers. They don't take control of an agent's decisions. They just threaten the agent with physical force and restraint, and carry out their threats if necessary. Policemen and jailers restrict our freedom, but it is a restriction we're willing to accept, for our own protection and safety. Now, return to God. If he were to get involved as a Divine Policeman, making threats and enforcing them, then would we be 'robots'? Seemingly not. Instead, we'd be citizens of a divine nation-state, and a very safe and reliable nation-state at that. But then the moral claim is dubious—it's no longer clear that God should hold back. Taking total control of our decisions would be wrong, but laying down the law might be right. So why hasn't God done it?
Several further challenges attack the idea that evil-eliminating divine interventions must cancel human freedom. These challenges suggest different ways for God to eliminate evil, all the while leaving our free will untouched—"innocent interventions". One proposal is that God allow sinful acts, but stop their evil consequences. So if I fire a rifle at your head, God allows me to make the decision, but then makes the trigger stick, or the rifle misfire, or the bullet pop out of existence. Such interventions would, happily, divorce evil choices from the subsequent suffering. Another proposal is for God to fortify humans as to render us less vulnerable to the sins of our fellows. We could be bullet-proof, invulnerable to poison, etc. That way, humans would retain the capacity for evil choices and activities; it's just that such evil behavior would be harmless to the 'victims' and futile for the evildoers.