The issue is that a multiverse is so much harder to fathom and support, because once we accept the multiverse theory, we begin to see the infinitely different possible universes (that being said, infinity is hard to comprehend as well).
In some ways, I feel like physics is starting to become a little more like religion though, and honestly some theories seem like they're stretching to find explanations that fit within our concept of beauty or symmetry or simplicity. Not that I'm a detractor of String Theory, but arguably we are getting into territory where it's likely we can neither prove nor disprove further possible explanations. I guess the biggest thing that bothers me though, is that most people would seem to prefer existence be somehow dependent on the phenomena of life rather than vice-versa.