Of all the arguments over conditions, the ones both for and against euthanasia are the most difficult. On the one hand are people truly suffering unbearably. It is unfair to make these people suffer needlessly and worse, to inflict watching that suffering on their families.
On the other is an overarching government anxious to weild power over the lives of those lesser beings, the citizens,that are governed. If a girl says "I'd rather die than wear that" there is a friendly government agent to say 'Right this way". The impetus is not to save lives, but to take them. This is harmful in a number of ways. The cheapness of killing certainly makes more economic sense than investing in expensive cures for deadly diseases. The utility of killing is easily expanded, especially when coupled with "If he was in his right mind, he'd rather die than go through this." That leads to wholesale slaughter.
Of course we should not allow assisted suicide. We aren't good enough a people to be trusted with the lives of others.