Scientists end up positing things to preserve their paradigm. For example the answer to why the universe looks designed in because infinite universes exist and our parameters just happen to be one of them. Or the answer to the heat death paradox that proves the universe cannot be eternal and a closed physical system is that the multiverse doesn’t follow the laws of thermodynamics, and it only applies to our universe. Or the answer to why Big Bang doesn’t fit the evidence is that there is matter we can’t see called dark matter that fixes the standard model.
There is a difference between a theory and a hypothesis, and there is just as much evidence for these claims as the claim that we are all in Santa Claus’s toy sack. But because we hold scientists to be wise men, we hold their myths as sagacious truth rather than just stories made up to save face.
They are not wise elders from a foreign land, sometimes they are just dirty old men who smell of rotten cabbage.