That's what Anne Widdecombe said on TV earlier this week on another subject, but it provides a perfect answer to the question Caroline Gammell posed in the Telegraph: Why was Kay Gilderdale in court charged with attempted murder?
A month after the Director of Public Prosecutions issued guidelines on assisted suicide that SPUC said "legally downgrade the right to life of disabled or terminally-ill people", Kay Gilderdale

My first reaction to the headline was to wonder why the woman might not be in court for attempted murder at least, but it was interesting to read on and find out that a spokesman for another mother who had killed her child shortly beforehand commented: "Frances’s conviction and sentence were wrong and for this lady it seems they have got it right".
The lady in question is Frances Inglis, who is also referenced in the Guardian's treatment of the Mrs Gild

The Disability Matters blog, however, fleshes out some details about what happened after Inglis' son, became brain-damaged after either falling out of or jumping from the ambulance that had come for him after he'd been in a fight:
Frances Inglis...immediately became obsessed with ending his life, repeatedly making the case to anyone who would listen that she did not think any treatment was in her son's best interest. She visited her son almost constantly and was described by Thomas’ brother, Alexander, as "obsessive and negative."Two grams of heroin is a prodigious amount but, even if only a quarter-pure, it would be a massive overdose. One only hopes that the material with which the heroin was "cut" - and cut it certainly was, as she bought it from dealers - wasn't medically active
Only 10 days after the accident, Inglis decided that she had to “put her son out of his misery.” So she injected him with a lethal dose of morphine. While Thomas was successfully resuscitated, he had been without oxygen long enough that his brain damage was much worse...Out on bail, a condition of which was that she go nowhere near Thomas, she disguised herself as Thomas' aunt, fooled the nurses, and injected Thomas with a fatal dose of heroin.

Pro-euthanasia campaigners would reply that if physician-assisted suicide were legal, Thomas would have been given pharmaceutical diamorphine (heroin), but, given the material above, it's by no means certain that a doctor would have considered Thomas eligible - although in a chilling caveat, Richard Normington quotes Dr Regina

In the end, we doctors are no different than the rest of you. We probably turn killer less often than most other occupations. But our ranks have and will always include the deeply flawed, the greedy, the delusional, bunglers, rationalizers and just plain sociopaths - like every other population.But the issue isn't doctor-assisted suicide, as opposed as I am to that. It's how we prevent, in some cases, abuse of the effective power that members of the above categories have to kill the sick relative of their choice, and in others - given assisted-suicide supporter Jamie Dettmer's assertion that Mrs. Gilderdale had sought to dissuade her bedridden daughter, Lynn, from wanting to end [her] life - people wracked by pain and despair and in crisis from unintentionally applying emotional blackmail upon their loved ones to act with lethal effect upon them.

That's why killing sick or disabled people, although it has always happened, has always been fenced in by a taboo which the Establishment is dismantling to all of our peril.
And, for all the guidelines revolving around assisted suicide and living wills, that's why Kay Gilderdale was in court charged with attempted murder.