Most of us will not have to deal with hostage situations; that is usually the responsibly of police, law enforcement and special units. In Israel we treat the subject very seriously and it is a part of our Krav Maga training courses.
We view this as everyone's responsibility. Certainly those in all aspects of law enforcement need to know these techniques, whether you are a prison guard, police officer or military, you never know when you will be called upon to handle a hostage situation.
In Israel our mindset is that everyone is a soldier; we all serve in the military, do reserves and we are all responsible for the welfare of the public. Our way of thinking is that life is unpredictable, you never know what is around the corner, and you never know when it will be your turn to be a hero.
You never know what is around the corner.
We train for situations where the hostage himself fights back, and for situations where a third person is called upon to 'negotiate' with the hostage taker.
These are not the kind of techniques we advise you to learn via photos on the internet, it is best to do so under the guidance of a trained instructor.