My brother in law had cancer so bad that it had spread into his sternum (which was so rotted with cancer that it would flex with every breath). The doctor gave him a prescription for morphine in pill form, and told him exactly how much to take, and that something between 4x to 6x of the regular dose was right out because it would be fatal. Had said brother-in-law been so inclined, he then knew how much morphine to take to overdose (he wasn't). He instead passed away in relative comfort in the care of Hospice.
My father didn't arrange for Hospice for my grandmother, and her death was harder because of the breathing issues. My father complained after her death, and I had to resist reaching over and throttling him for his lack of insight.
If the elder Mr. Adams truly was suffering while dying, then Scott should have arranged for Hospice care. Failure to do so would have been Scott's fault.
Now, the younger Mr. Adams may be suffering from a category error: "death with dignity". We don't come into the world with dignity; we come in naked, ugly, and screaming. The concept that birth, life, or death should be sterile, peaceful, and risk-free is a fallacy of our modern selfish world. The concept that the process of death itself is suffering or "subhuman" is absurd; dying is just a part of living.
I respect the man who was paralyzed in bed and on a vent who asked for the vent to be turned off; he couldn't do so himself. If you are conscious, you have the right to refuse any medical treatment. If you are unconscious, you have the right to have written your desires out in advance. However, no person has the right to demand that another end his life for him; that is manslaughter. If you wish to choose your own time of life, then pick a time and a method, and then follow through with it. I won't think it's right, but at least it is respectable.
Most people demanding euthanasia on demand simply want someone else to do the deed so that they don't have to do the dirty work themselves.