Crime
It is not my intention to encourage any sort of crime whatsoever in Bangladesh, but my objective is to express my viewpoint on the causes of crime. Bangladesh is the most densely populated (also underdeveloped) country in the world. Most of us live under poverty line in terms of living standard. With so many people unhappy and crammed in a small place, commotion of any kind is possible, I believe.
If we consider the size of the population, I find that there are more crimes in the US even though it has sophisticated and modern techniques to tackle crime. I think the same is true about China and India (if I am not wrong).
With an increase in population, other factors will also increase.