Because Idealism would be a manifestation of the state of the greater mind as outlined by AKD. So no matter what happens, it has no bearing on the real mind as all we are experiencing is just a manifestation of that mind (if I understand it correct). Therefore whether in this "reality" you live to be a world leader or a serial rapist, is meaningless to the "real mind".
We are not made happy by what we acquire but by what we appreciate.