LOL!
A little islamic humor there, eh?
Actually, I tend to think of this as a sort Darwinian selection process, during which those too stupid to move a way from an active volcano get moved to the very shallow end of the gene pool.
1) Java is one of the most crowded places on earth.
2) The soil is really fertile next to volcanoes.
3) Indonesia is a corrupt country and poor people who don't have much to begin with have no faith (probably correctly) that the army or police will protect their meager possessions if they evacuate.