so callednatural disasters (my emphasis)
What exactly makes a natural disaster 'so called'
Unfortunately you are glossing over the fact that not all natural disasters are of the same scale. There are earthquakes all the time, but not all of them result in untold misery and suffering. It's the same with every other natural phenomenon.
The other problem is that natural disasters have nothing whatsoever to do with free will.
It seems your argument boils down to god likes to do do a lot of killing to remind everyone how much he loves them.