A new philosophical model helps to understand disability differently

A new model called the Conditional Bad-Difference View (Conditional BDV) is published in Bioethics. It seeks to overcome the limitations of the two traditional views of disability and to offer a more flexible and respectful approach to the different life situations of people with disabilities.

Until now, two views have dominated philosophy. The first, the "bad difference model" (BDV), assumes that disability impairs the quality of life regardless of conditions. The second, the "mere difference model" (MDV), holds that disability is ethically neutral in society without discrimination like race or gender.

Conditional BDV offers an alternative: a disability is considered harmful only when it prevents a person from achieving their goals.

"Our model reflects the diversity of life paths of people with disabilities, something often lacking in previous theories," explained the study's lead author, Professor Shu Ishishida of Hiroshima University. - "The extent to which disability affects well-being depends on whether it interferes with an individual's aspirations."

The authors backed up their theory with philosophical analyses and mental experiments, showing that traditional approaches are insufficient to understand the complexity of these situations. Conditional BDV, on the other hand, allows both external conditions and an individual's internal desires to be taken into account, emphasising the individual context.

The researchers also addressed several criticisms. One of these, 'goal renewability', suggests that many goals can be achieved in alternative ways despite the disability. However, the authors emphasise: the combination of disabilities can seriously narrow life opportunities.

Another objection is that disability sometimes brings new and unique experiences that can enrich lives. The authors agree that this happens, but cannot be a universal justification for the benefits of disability - everyone's experience is too different.

Some questions remain open. In particular, critics question whether Conditional BDV can be used to evaluate ethical dilemmas like breeding embryos with disabilities. But the authors say such difficulties are common to all existing theories, and do not undermine the usefulness of the proposed approach.

Study co-author Professor Tsutomu Sawai emphasised that the new model sets philosophical guidelines rather than ready-made prescriptions.

"The concept better aligns with the development of technology to support people with disabilities and makes them active participants in the discussion," he said.

Scientists from Spain and Japan also joined the study: Mitsuru Sasaki-Honda from the Institute of Biomedicine and Biotechnology of Cantabria and Kyoto University.