Dhaka, Sept. 13 -- The whole world thinks of the United States as a land of expectations: a time-tested yet noisy democracy, crusader in foreign policy, an exporter of beloved pop culture including music, sports and films - but there is one quirk that consistently puzzles America's fans and critics alike; why, they ask, has it experienced several mass shootings in these days? Some assume, while the American society is unusually violent, its racial divisions have frayed the bonds of society or its citizen lacks proper mental care under a health care system that draws frequent derision abroad. However, the root of the violence is nowhere near these assumptions. It can be believed that America certainly does not have control over massacres b...