I find its best (and definitely more humble) not to consider whether or not God is visiting his wrath on anyone unless I have been beset myself. Then, in my strange little world, and only then is it appropriate for me to say, "Hmmm, I wonder if God is upset with me..." Even then, I try not to approach it as a victim, but as one who must reconsider my recent actions to see if there is cause to change my ways. Any other projection risks the fate of a prophet.
This is the best way to approach it. However, the BlackJack post can be treated in two ways, it's either the man was really astounded and shocked by the magnitude of the tragedy and is trying to find some explanation or it is a sheer provocation. But the response it provoked is quite encouraging. The deisaster, in my view, is nor of divine providense, but is totally man-made. You cannot prevent a phenomenon like that, but you can predict it and alert tje people. This is 21st century after all. Now the people screwed up real bad and G-d is taking the rap.