It's an important question for those with faith, OP. How can we possibly believe in a God who is good and loves us?
I firmly and passionately believe in God and experience God as good, loving and graceful. This does not mean I can provide answers to these huge questions of why, and suspect if I tried they would sound trite and inadequate.
There's a bit if poetry in the NT which talks about creation groaning, waiting to be righted once again. I think our world is off balance, fallen, groaning to be released. And in this time, bad stuff just happens. I don't think God sends earthquakes or cancer or war, it happens or people decide for it to happen in the latter case. Happens because the world is skewed and happens because of evil.
This goes no way toward providing answers, I know. I'm not trying to justify it to myself, either. I'm well aware of the problem of theodicy and wrestle with it constantly, but it has never yet stopped my faith. It's come close, but in the end my experience of God has been that of lives transformed to the good, of grace in the face of the most hideous circumstances, of overwhelming love apparent in the darkest of times.
I agree with Mrs De Vere that people say crap about God's design when it comes to suffering. They say it is for a reason, or he wanted that child back (ugh) or for punishment (even more ugh). The fact is, the shit stuff happens. I do not try to justify God's purpose in it, but simply ask where I can see God in it and what God wants us to do about it. I can sit and theorise all I like about why this thing has happened in Nepal, but if I am not doing all I can to help then I am not honouring my God.
I'm sorry I can't answer, op. I can only give my experience of hope. Many of you think I'm utterly deluded. That's ok. I'm fairly rational and a thinking person. Have I put this part of my mind to sleep, hidden it away in fear of what may happen if I bring it to light? I don't think I have. I think I face it full on, and still can't lose this unswerving hope I have. others say I must have this faith as a comfort blanket. It's really not that comforting, actually, when looking at questions like these - it's starkly difficult.
It'd be a lot easier to not believe, I sometimes think. But I simply cannot, and do not wish to, for there are depths of wonder, beauty and peace about this faith in this God.