Why Is the Multiverse Theory So Popular?

Should the fine-tuning turn out to be real, what are we to make of it? There are two widely-discussed possibilities: either God fine-tuned the universe for us to be here, or there are (as string theory implies) a large number of universes, each with different laws of physics, and we happen to find ourselves in a universe where the laws happen to be just right for us to live. After all, how could we not?
http://www.newscientist.com/blogs/culturelab/2010/05/looking-for-god-in-the-cosmic-details.html

But the main reason for believing in an ensemble of universes is that it could explain why the laws governing our Universe appear to be so finely turned for our existence ... This fine-tuning has two possible explanations. Either the Universe was designed specifically for us by a creator or there is a multitude of universes -- a multiverse.
http://www2.asa3.org/archive/evolution/199806/0130.html

anything that can happen will happen; in fact, it will happen an infinite number of times. Thus, the question of what is possible becomes trivial -- anything is possible, unless it violates some absolute conservation law.

Cosmologist Alan Guth. Pffttt... the fallacy of infinite possibility. Cosmolgists... oh boy.

Just as Darwin and Wallace explained how the wonderful adaptations of living forms could arise without supernatural intervention, so the string landscape may explain how the constants of nature that we observe can take values suitable for life without being fine-tuned by a benevolent creator.

Steven Weinberg. Haha, two failed theories don't make a right. Sums up the motivation with clarity though.

The simplest and most popular cosmological model today predicts that you have a twin in a galaxy about 10^1028 meters from here. This distance is so large that it is beyond astronomical, but that does not make your doppelgänger any less real...

Max Tegmark. What a joke.

Yeah, you don't have to be a genius to see this for what it really is.
 
There's a certain amusing irony to it all. On the one hand, there's this oft-appealed Occamism to not multiply entities beyond that which is required to explain something, but on the other hand there's a tightly grasped desire to multiply universes to infinity so that everything can be explained with, "That's all it is folks! Nothing to see here!"
 
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