Yet another random attack in Sydney. It is tempting to explain all these incidents as part of some sort of rational strategy – which can be countered the way Soviet designs were ostensibly defused during the cold war. On the other hand, there is some research indicating that culture shock (as in the case of immigration) can push some vulnerable individuals over the edge – and into a clinical expression of schizophrenia. I am wondering if a similar form of psychosis could be a better story explaining the recent spate of ISIS-inspired attacks. To say nothing of the whole idea of a global caliphate under the black flag – which is clearly delusional.