The evidence in favor of legalizing euthanasia is overwhelming. Besides the moral justification for putting human beings out of their terminally ill misery, so far, only the wealthy are capable of traveling to countries where it's legal, begging the question of whether governments are treating the haves better than the have-nots. If we wish to control the legal framework surrounding where assisted suicide goes too far, it would behoove elected officials to write their own nuanced laws.
The slippery slope of euthanasia is very real and very dangerous. Many of the patients involved in this debate are cognitively impaired and unable to fully understand what they're getting themselves into. Most importantly, this will give doctors, who often make wrong diagnoses, way too much power and legal protection after taking someone's life. We already have the medicine to eliminate patients' pain in these scenarios, so why not use it while keeping them alive?