An eye for an eye

Just read an article on a step mom who killed her step son by submerging him into scolding hot water.  
That makes me sick. I immediately think that she should have the same done to her!!   
Or the disgusting pedophiles who rape children... They should get a taste of their own medicine.
I feel this way about most crimes. That the punishment should be exactly what they did to someone else done to them. 
I understand each situation is different (i.e. Self defense) but I am thinking in a broad spectrum.  
What do you think? 

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