Because mental health issues can be recovered from, they aren't terminal illnesses.
I think it's reasonable to look at the experiences of other countries and see how 'mission creep' has led to unintended consequences with assisted dying. It accounts for 4.7% of deaths in Canada, 5.4% of deaths in the Netherlands.
Yet every safeguard that would help ensure that in Kim Leadbetter's law has been voted down.
Research from the Netherlands on GP's experience suggests it isn't as trouble free as you suggest.
https://pmc.ncbi.nlm.nih.gov/articles/PMC7960528/
52% of GP's felt assisted dying was an emotional burden for them. 47% felt uncertain about the mental competence of those who chose it due to dementia to make a decision. 42% felt pressured by relatives.
How can euthanising those with a mental illness ever be guaranteed to be a 'solid decision' by the patient? It's the mental illness that contributes to them thinking dying is the only solution.
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There are so many aspects to this piece of UK legislation. There's coercive issues, disability rights issues. There's the way that assisted dying is a class and sex issue. The whole thing about how we as a society view disability and mental illness and the idea of 'a life worth living'.
We have to look beyond the bodily autonomy argument and the 'I don't want to die in pain like xxxx did ...' to the wider issues that affect others.