What sacrfice does Mcmurphy make? why?

McMurphy pretty much gives up his mind. He assumes the role of selfless martyr in this chapter, defending George Sorenson against the invasive cleaning procedures of the black boys. In the past, his decisions generally benefited him monetarily or built his reputation. But this is a time when McMurphy is motivated least by self-interest, for he can gain very little or nothing from defending Sorenson.

Christian symbolism dominates Chapter Twenty-Seven, which more fully completes the analogy between McMurphy and Jesus Christ. “I wash my hands of the whole deal” is a direct allusion to Pontius Pilate, who made a similar comment upon ordering the crucifixion of Christ. McMurphy himself realizes this comparison when he asks whether or not he gets a “crown of thorns,” another reference to the crucifixion.