ostrichism
/ˈɒstrɪtʃɪz(ə)m/ /ˈɒstrɪdʒɪz(ə)m/noun
The action of (figuratively) hiding one's head in the sand; the practice or policy of refusing to face reality or accept facts.
Origin
Mid 19th century; earliest use found in Tait's Magazine. From ostrich + -ism.