Are victims of mesothelioma all industrial workers?

No,in fact the focus. On asbestos exposure, while likely causative, is not always clearly identified in many cases of mesothelioma. Also, spouses laudering and living with such a worker, occasional develop the disease, when the worker does not. The lead time from exposure to disease may be 30 years. While we have an answer, we surely do not have all the answers.
Not all. Asbestos exposure. A common material used few decades ago with very attractive properties including insulation but very harmful for the health of people exposed. Exposure came in many different levels including building, installation, removal and disposal of the material.