I will prove to you that God exists

[Mister Agenda]

Or that the physical constants of universes are constrained. Just sayin'.

They wouldn't be called constants otherwise. The irony of this argument is its the preferred explanation for why we live in a universe that is fine-tuned for life is because they claim we live in an infinitude of universes with variable constants and we exist in the one that allowed our existence by happenstance. As if none of these scientists considered the possibility that it had to come out as it did. They reject that because it wouldn't look any different than being intentionally caused to be this way to produce life.

Pretty sure they don't reject it, many worlds is just a hypothesis, after all. It may be more entertaining to think about alternate worlds than 'the universe is the way it is because that's the only way it can be'; but at this point there's no way to test either hypothesis.