go too far vs pile on

go too far

verb
  • To exceed an unstated limit, especially a limit of acceptable behaviour. 

pile on

verb
  • To unnecessarily extend the margin of a winning score. 

  • To criticize someone or something in a concerted effort. 

  • To jump on top of someone or something quickly. 

noun
  • An argument or fight in which one side is greatly advantaged by being more numerous or more closely allied than the other side. 

How often have the words go too far and pile on occurred in a corpus of books? (source: Google Ngram Viewer )