Just as long as its voluntary... but how can you ever assure that? That there's no coercion, temporary depression, etc. So, you can't assure that...

The real question is why are governments so keen to legalise euthanasia?

My view is its about population management. It eases the expenses, clears out the dead wood, etc. Governments really do think it is right that they should choose how long their citizens are around for, even if they say otherwise - its about control. I don't even think it's the only strategy they have to manage the population, nor even the most common one.