I decided to answer the more general question, although perhaps this would be better in a separate discussion about suffering. I'm likely to repeat these contents in a thread that is more widely read.
The issue of suffering is, in my opinion, the most serious credibility issue for theism (aside from the more general question of evidence). It's also one for which it's hard to make an unambiguous argument, because we don't agree on what is OK for God to do and what it isn't.
My impression is that the Biblical picture of God is pretty consistent: he's got a lot of power and influence, but has chosen not to use brute force very often. How much power is, I think, open to question. Enough to bring Israel out of Egypt. Enough to bring order from chaos. But when we get beyond the world as ancient Israel knew it, things are less clear. I assume we're find some kind of space out of which big bangs come. Does God live there? If so, is he subject to rules in that space? Or is he in some space entirely his own? This is waaaayyyyy beyond anything I can talk about. But at some level, there are probably realities he can't change. Like non-contradiction, and the inability to both control people and not control them at the same time.
In the whole OT, God sends prophets. Now and then, particularly in older parts of the record, they have unambiguous signs, such as Elijah's face-off with the prophets of Baal. But by and large the prophets present God's ideals, but the people ignore them or follow them very imperfectly. Israel gets conquered, and this is in some sense punishment, but to a large extent it's also the natural consequence of what they did. In Hosea God presents himself as a jilted lover.
In my opinion, Jesus' principled non-use of force, and the whole concept of God intervening by joining us, showing us how to live, and accepting the consequences of our sins, is consistent with God as we see him in the prophets, if you read the prophets carefully. I claim that setting up a dangerous world where suffering happens, is quite consistent with this whole picture.
I can't justify it, because I doubt we have a common standard I could appeal to. I can only give analogies. In human affairs we normally believe that it's good for people to develop as independent, responsible, people, even when this entails suffering:
- Parents can't be overprotective. The Truman Show is an interesting example of what some people would have God do: a completely controlled environment, where nothing very serious can happen to Truman. Yet most viewers think this was immoral, and Truman was right both to be upset and to leave.
- There have been various kinds of interaction between different cultures on earth. Most people think that trying to push the benefits of more "advanced" cultures on others is bad, even when it is clear that they would be physically better off with our culture than their own.
- In Star Trek, I think most people accept that the Prime Directive is a good idea, even when it leaves millions of people to suffer in ways that they would not if the Federation immediately raised them to its level. In the original series, Kirk often found excuses to avoid this. But that's not as true in the later series. One of the starkest examples is Star Trek: Enterpise, "Dear Doctor." They end up leaving a whole race to die, when they could have cured them.
Not everyone will agree with every situation. But I don't think it's obviously immoral for God to set up, or possibly tolerate (depending upon what choices you think are available to him) a situation where the world is dangerous, and failure brings actual consequences. Through Jesus, and his involvement with many of us, he accepts responsibility for the consequences, and to some extent joins us in them (although his experience as God is vicarious; it's obvious that God qua God doesn't physically suffer). But he normally depends upon us to improve the situation.
I can sympathize with people who think that a real God could find a way around this, but I'm not so sure he would be right to do so.