Why is it easier to accept an infinite number of parallel universes than the role of the observer or consciousness in quantum mechanics?
According to books like Hidden Reality by Brian Greene and others like it, it is easier for the scientific community to accept the multiverse explanation of quantum mechanics’ measurement problem (an atom being a bunch of probabilities and only once measured or observed becoming an real entity), than the consciousness or observer explanation (Copenhagen interpretation of quantum mechanics).
The multiverse explanation requires an infinite number of unseen and never to be proven parallel universes. On the other hand, the Copenhagen interpretation requires consciousness. Nonetheless, the multiverse explanation is the favorite of most authors and physicists.