blame vs exculpation

blame

verb
  • To censure (someone or something); to criticize. 

  • To assert the cause of some bad event. 

  • To assert or consider that someone is the cause of something negative; to place blame, to attribute responsibility (for something negative or for doing something negative). 

noun
  • Culpability for something negative or undesirable. 

  • A source control feature that can show which user was responsible for a particular portion of the source code. 

  • Censure. 

  • Responsibility for something meriting censure. 

exculpation

noun
  • The act of exculpating from alleged fault or crime. 

  • That which exculpates; an excuse. 

How often have the words blame and exculpation occurred in a corpus of books? (source: Google Ngram Viewer )