Murderers and victims

From my point of view a conversation in a pub could be very inspiriting. In fact I've just had one with a group of criminology students and I desire to tell you what they have said me.
First of all, they have explained me that there are different types of murderers and victims. Normally murderers have suffered some bad experience in their childhood, they do whatever they saw in their house: if their fathers beat their mothers then theses boys will beat their handcuffs.
Long time ago, police thought that ugly people or citizens with tattoos were criminals, only because of their appearance. Something really stupid. Studies say that there two principal types of murderess: those who have a normal life with their family but they have a second face; or solitary people that have a perfect prototype of person and they try to kill him/her.
Furthermore, there are two general types of victims: guilty people and innocent people. A guilty victim probably sound strange, I will give you an example: if you plan a bank robbery and you die during it, then you are a victim but you are guilty too. The other kind of victim is the innocent person who is killed and he or she hasn't any fault.
To conclude: even if you are studying another degree you should listen other stories and facts because knowledge don't take place.