Why and how we must prevent a hostage taking???

As a students we must have a knowledge about any hostage taking in our place.
We all know that in a hostage taking is a very serious problem in our community.
Why can we prevent it and what the reasons why other peoples doing this kind of criminal?
Please give me some answer on how we can prevent a hostage taking and how can we prevent it...

In my own idea, other people doing this kind of criminal because powerful persons give them a very low salary or not good experiences about the work they given to them. Low class people having a bad idea that they took themselves to do this kind of criminal work.

I give you many of my comment next week.. please concern to our community and being kind to the people who work clean and good to us . !!