What if not just Earth, but our whole universe, is seen as one mere Copernican blip? The Copernican principle, as a principle of interpretation, obviates the need for evidence. As a New Scientist writer has explained,

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.

The reasoning is quite clear: The need to account for fine-tuning without design, not evidence, is the driving force behind the idea.