retreatism
/rɪˈtriːtɪz(ə)m/noun
1Withdrawal, especially from society; (Sociology ) the abandonment or rejection of culturally approved goals and the institutionalized means of attaining them, induced by a perceived inability to achieve those goals.
2Advocacy of a policy of (typically military) retreat; a policy characterized by the advocacy of retreat.
Origin
1920s; earliest use found in The Dial. From retreat + -ism.