How Evolutionary Biology Challenges Moral Truth

Moral realism is views that moral facts,moral truths are objective exist,refer to features of the world.Moral realism presupposes cognitivism account,admit we can cognit and judge moral facts.Then,moral realism has various expiations about the ontology position of moral facts including naturalism and non-naturalism.Then,we can say,moral realism provides an expiation system to complex metaethical problems.Evolutionary Debunking Arguments are a kind of challenge to moral realism based on Darwin' s evolution theory.In evolutionary views,our abilities for moral judgements do not require the understanding of moral truth,even its existence.Evolution theory claims only describe the natural selection pressure forces us to form and improve these abilities,because these consequences or features have biogeology advantages.Several philosophers have claimed that evolutionary theory can be used to undermine our confidence in the existence of moral truth or in the possibility of moral knowledge.These issues were being discussed soon after the publishing of Darwin's Origin of Species.Until 2006,Sharon Street and Richard Joyce proposed two different but related kinds of Evolutionary Debunking Arguments made this issue reappeared in metaethics.Lots of philosophers participated in the discussion,support or deny,and some new theories evolved inThis essay takes a brief review of moral realism,investigate its views and problems.Then take Street's article and Joyce's book as the start to investigate Evolutionary Debunking Arguments.The first part gives a brief of center problems in debunking arguments,including its origin and basic form.The second part tries to analyze and evaluate Darwinian's Dilemma as Street claims,analyze its construction and objection from David Copp,who argued with his society-centered moral naturalism,and Street's response.The third part focus on Richard' s origins of moral concepts and their genealogical features,made an interpretation of moral nativism and how does moral nativism affect our moral justification,finally is an analyze of objection from FitzPatrick,concerns the moral content and its best explanation.