This is what I mean about unavoidable suffering. The following is a hypothesis only:
People have asked: why couldn't we eliminate the suffering from earthquakes by having a planet to live on where there are no earthquakes? This is a good example, because it can show what I mean by logically unavoidable suffering for the greater good. There's a reason why there are earthquakes on this planet, but no earthquakes on Mars. The Earth is still geologically active partially because it is bigger than mars, but this is not the primary reason. The primary reason is because Earth has a much higher proportion of heavy radioactive elements in it's core in proportion to it's size. There is a reason for this, too. The Earth-Moon system was created by the collision of two planets. The moon is made of the lightest bits that were ejected furthest from the collision zone and the Earth is made from the cores of both planets plus whatever was left over. So we got a double dose of the heavy stuff. This is also why there is so much iron on Earth and why the planet has such a large iron/nickel core. Why does this matter? It matters because life on earth is absolutely dependent on that disproportionately large iron-nickel core because it is the reason why the Earth has a powerful-enough magnetic field to deflect the solar wind and prevent life on earth from being frazzled with solar radiation. We need that magnetic field, so we need the massive iron/nickel core and there is no way to end up with a massive iron/nickel core without ending up with the radioactive elements which cause that core to heat up, inevitably resulting in earthquakes, volcanoes and tsunamis at the surface.
That sounds like a good theory. Certainly, we don't seem to have examples of radiation-resistant life forms that can thrive on a planet without the magnetic field.
On the other hand, if we're talking about a God (as many Christians, et. al. do) who can deliberately cause certain events, why can't we conceive of a planet with strong magnetic fields, but no tectonic activity? Or of a star whose radiation is not harmful to life forms (as we know them)?
This is where the problem of evil comes to play. If God the Creator is a being with will, intent, and purpose, and has (within logical limits) infinite powers to create, why would he not simply create a world without tectonic activity, deliberately seeded with intelligent life? Otherwise, the god in question is no different from the mindless forces of physics and laws of nature... and is therefore irrelevant (from a theological standpoint).
In other words, the problem of evil asks why, if God is capable of doing so, can't He make a world which sustains life without natural disasters. The answer you provide above is, He can't. Hence, he is unworthy of worship as a Supreme Being.
Heck, give mankind another million years or so, and we'll be engineering our OWN habitat worlds - without the natural disasters. (Yeah - instead we'll get power failures, shoddy workmanship, decaying orbits, etc... )