Say there are two, mutually exclusive hypotheses A and B. Both are unfalsifiable with current knowledge and technology, but lead to starkly different ontologies. Now say I find the logical consequences A subjectively better than those of B and, fully acknowledging the unfalsifiability of either, I choose to believe that A is true, for all practical purposes.
Is there a name for this attitude, or for someone who does this?
An example: There is no reason to definitely exclude that the whole world as I experience it, including my body, is the inside of a simulation. Conversely, it is impossible to prove that there is a "real" world of some sort, where other bodies and minds live. However, the latter ontology is, in my opinion, far more hopeful and pleasant and full of meaning, so I reject brain in a vat. I am happier. I am open to be disproven, but for the present time, and for all practical purposes, I firmly believe in a "real world" with other minds.