If you allow for a purely capitalistic society without any type of regulation at all you will get one monopoly that will eat all of the smaller fish and own everything and then you'll have zero capitalism zero competition - it would just be one giant company.
I don't think that anyone seriously fears that the world can be blown to pieces all together. But what one can fear and rightly so are regional things like in the Middle East India Pakistan the Korean Peninsula borders in Africa etc.
