Just read the Less Wrong sequence on QM. All the answers to your questions may be found there. I consider myself an aspiring disciple of Jaynes, probably as versed as any living human being in the ways of the Mind Projection Fallacy, and MWI is the version of QM which does not have such difficulties.

You've certainly arrived at the correct website to find the answers that you in particular seek, fellow Bayesian and Jaynesian; but you're being voted down because you haven't read the existing material.