The EPI is heavily funded by labour unions which have a major stake in the continued acceptance of central tenets of Marxist/postmodernist ideology, like the existence of race/gender/class based social dominance hierarchy and the importance of creating laws that discriminate against the identity group that is perceived to be at the top of this hierarchy.
For a scientist's analysis of the memo, see this:
http://www.theglobeandmail.com/opinion/no-the-google-manifes...