Dadaists believed that society's regulated, authoritative, historical reasoning was delusional, and that the natural world, of which man was a small part, was governed by both logic and chaos.
Rationality, reason, mathematics and science had all been co-opted by the war machine of the First World War. As a consequence, Dadaists considered reason itself to be discredited.
As Jean Arp put it, 'Dada aimed to destroy the reasonable deceptions of man and recover the natural and unreasonable order.'
Reason Is a Hoax
discredits the entire Age of Enlightenment, calling into question the value of rational thought if all it leads to is war.