One universe or multiverses? wavefunctions, etc.

I love this stuff, because it's predicated on the assumption that 'bullshit baffles brains', and my bullshit may be just as valid as yours, or alternatively, we may all be full of it.

Quantum mechanics and its wavefunction theory is largely 'educated guessing' by eggheads with nothing better to do than play 'silly buggers' with each other's bag of tricks. "One universe, or a multitude of universes?" From a purely selfish point of view, since I'm only in one of them (as far as I know) then it's strictly a hypothetical argument.

We don't understand our existing universe because the combined total of our collective knowledge about it is less than four percent of what's available, so we're coming into this from a position of more than 96% ignorance, and that renders our conclusions very insubstantial. Get the picture? And my personal share of that 96% ignorance is probably just as vital and vigorous as yours.

We're having trouble sorting it all out because we're assuming it had a finite beginning, which we call 'The Big Bang'. But hold on a minute here. In order for there to have been a Big Bang, there must have been something precipitating that event, and therefore pre-existing it - and that mysterious something would obviously have interacted with whatever happened during the Big Bang. So what I'm taking too long to get to here is that whatever we've got now in this universe is most likely a mixture or combination of ingredients from the era before the Big Bang, and afterwards. Why? Because: It takes something to make something. We can't combine two nothings into a something, so if we have a something now, we must have had other somethings before this, which made up the something we've got now. This isn't Rocket Science, Kiddies....

And the whole thing must be infinite, because otherwise it wouldn't be here, and we wouldn't be having this hypothetical debate about it. Any questions?