Bangladesh is one of the poorest and most desperate nations on Earth. Honestly, I'm not surprised this happened. Yes, the act was thoroughly awful and sick, but you have to remember that Bangladesh is the sort of place where the average person's daily struggle is just acquiring the next meal. Unfortunately, humans tend to show their worst traits when they are most desperate and when religion replaces a lack of knowledge. Keep in mind, however, that this is not representative of the average Muslim. This would be considered illegal and utterly disgusting to an Albanian or Turk, for example. I'm sure many Bangladeshis find it disgusting as well.