No, we cannot say that the Universe is a mistake or a consequence of symmetry breaking in that sense. Symmetry breaking is a concept in physics that refers to a phenomenon where a system that exhibits symmetries in its fundamental laws or equations does not exhibit those symmetries in its observed state. This can lead to the emergence of different properties or behaviors in the system.
In the context of particle physics, symmetry breaking is related to the phenomenon known as the Higgs mechanism, which explains how elementary particles acquire mass. It does not imply that the Universe itself is a mistake or an unintended consequence.
The expansion of the Universe is a fundamental property of the cosmos, and it is not considered a result of symmetry breaking. The expansion is described by the Big Bang theory, which suggests that the Universe originated from an extremely dense and hot state about 13.8 billion years ago. The ongoing expansion is driven by the properties of space itself, such as dark energy, as I mentioned in a previous response.
While the specific causes and mechanisms behind the origin and nature of the Universe are still the subject of scientific inquiry, it is important to approach these questions without assigning value judgments like "mistake" or assuming intent on the part of nature. Our current scientific understanding of the Universe is based on observational evidence and theoretical models, and it continues to evolve as we gather more data and refine our theories.