I am not meaning to be confrontational, Miscellaneous, although I know this is an emotive topic. Believe me, I did read your post. You said:
*"Disability is not a value judgement. It's simply a definition of whether a physical or mental condition (such as an illness or an injury) damages or limits a person's physical or mental abilities....
...But at no point in the definition is a value judgement, or a reference to how the condition was caused. It's not about whether the disability is socially approved, whether you want to give sympathy, benefits, lock them away, or leave people to starve. That is a completely separate discussion. It's not factually correct to conflate the two, and it's rather disgusting to read.
So by all means have those discussions. But don't confuse that with the definition of disability itself"*
This isn't correct. Parliament made value judgments in deciding who qualifies for rights as a disabled person, and that is embedded in the statutory definition of "disability". That may be something you disagree with, but the idea of excluding certain conditions from the definition of "disability" as a matter of policy is not new, so we mustn't pretend that it is.
If you think there is another reason for excluding drug and alcohol abuse from the definition of "disability" that cannot be described as a value judgment, then I am wrong. But I don't think there is.
I fully agree that by going down this route, parliament was on thin ice. Obesity is probably the most obvious area the question would come up (because obesity can be caused by lots of physical and mental impairments that may or not of themselves constitute "disability" as defined) and this was all totally foreseeable.
Not trying to agree or disagree with your underlying point about the rights and wrongs of excluding obesity as a disability (I am undecided on this), but we should not pretend that there are no value judgments in the law already or that this is something entirely new.