If a person wishes to be euthenased due to terminal illness I have great sympathy and would vote to allow it here with a few safeguards. Suicide is different, often the victims have lost the will to live and or have forgotten how to live and that is different. They may have been bullied at work, perhaps they feel inadequate or useless because they are taken for granted.
As an earlier post said this is a complex area and one which is not easily resolved.