The original OP story is certainly tragic but it did not surprise me that the women took her own life following the court case.
The original question posed
Can anyone give a rational reason as to why assisted suicide should be illegal?
I doubt that anyone will be able to give you a proper answer to this. However, preparing something for a loved one to take and then leaving the room/house is something that I would consider but there would be a lot of soul searching before I would go through with it, even if my loved one was in so much pain or the chance of recovering from a terminal illness would put them at peace.
But would I physically inject something or put the tablets or 'drug laced drink' in their mouths that is something I would not do.
Let us look at the medical ethics of the situation of allowing a doctor to administer a narcotic that would end a person's life. There will be very few, if any, medical associations that would permit its members (namely doctors) to assist a suicide. It is why, in the US, that doctors are prohibited from assisting at executions and this is how it should be.
Someone mentioned that they resuscitated an elderly women who had taken an overdose of drugs to end her life and left a letter stating that she did not want to be resusitated. The women's written wishes
SHOULD have been adhered to and she should have been allowed to die. If a patient has their medical records tagged DO NOT RESUSCITATE then that should be the main thing.
Yes, suicide leaves a lot of people behind that say "What could we have done to prevent this?" but I look at it this way...they person is at peace.
Do I think laws should be changed to allow someone to assist someone who wishes to end their lives. Yes! Will it happen? No.
There have been cases were someone has been charged with assisting a suicide and I cannot recall of anyone who has been sent to jail for assisting a suicide with the exception of that doctor who has decided to run for Congress.