In reply to Blue Straggler:
Surely the question is more "Should this sort of behaviour require the attention of the law?" There's a whole lot of contextual information that makes the difference in a given case of "person a enables person b to end their life." We don't have the full facts in this one as yet but it seems right to me that it's brought to court. We don't know what will be decided, but it seems right to me, in the absence of formal organisations to provide a service equivalent to Dignitas, that when someone takes this course of action that what happens is thoroughly investigated to prevent abuse.
If it was 'legal' in this country their would be checks and balances, proper processes and trained staff to ensure that, for example, you weren't being coerced into your course of action and that you were in the right frame of mind. It wouldn't be your 18 year old mate doing to the DIY store and driving you to a field.