well talking about the causes I think
only a few number of kidnappers ask for ransom and take them like a hostage only a few.
another serious cause that we need to pay attention to it is that some kidnappers are freak or abnormal they violate and kill this is a serious cause I think there is a diffrence between kidnappers in algeria and america for instan ce there they kidnap to get money or for affairs but here still we got no clues!