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If you believe that people were born in tabula rasa (meaning people were born with a blank state without any idea of rules) then it is socialization within society that promotes decadence.
If you believe that humans were born innately with a set of processes that are passed down through evolution that give us a hardwired sense of right from wrong, then I would say that we choose decadence.
There is scientific research supporting both theories.
Either way I don't believe anyone is to blame.