To me, the answer is so screamingly obvious that the only questions I have are under what circumstances did Buffy come to the conclusion that theft was the only way to save the world;

Yet she doesn't say "it was a matter of life and death" or " the destiny of the mankind was at stake". Her first reaction is: "It's all insured! It's a victimless crime! And we totally found a Watto the Nazis hid and sent it to the Tate".

It's just... weird. Could the ubstable reality create the aberrations of people's behavior?