In their home countries, capital punishments are no joke. When they see that they can have some time in a western prison with free food, it doesn't sound that unpleasant compared to the living conditions back at their country. Many of them laugh at such a prospect.

Rape and murder in their country means getting some hellish time in prison before execution, while in a European country means a few years in a relatively comfortable prison networking with others of the same feather.