Actually it begins with the government allowing it in the first place. Because euthanasia is a procedure like any other, it needs regulation and a law approving its existence - Otherwise it is illegal. For a law to be passed legalizing something, a valid reason must be given. What is the most common reason for legalizing euthanasia? Well there's two actually - Pain/suffering and the inability to terminate your life so you need medical support. If only consent is needed without further due, then we might as well create specialists just for the purpose of euthanising people, because any one for any reason can come up to a doctor and say "Hey, I don't want to live anymore". It's extremely complicated to allow this given that it violates the first principle any doctor swears to respect - The preservation of life. Those who have an interpretation that allows to bypass the principle and perform euthanasia are the reason why it happens in the first place. It is a right, but it is also a commodity.
Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you
