GOP wants to bring back actual death panels to deny coverage, and thus needed care to the sick.
Actually I am ok with the "death panels". We already have them in the form of ethics boards which operate in every hospital in this country and similar review is done in England and other places with national healthcare systems. Usually an ethics board made up of a mix of docs, administrators, religious leaders, and lay people of the public of various backgrounds who review cases to determine the ethics of pursuing further care. For example, lets say a 95 year old guy shows up in a hospital and he is intubated, has no family members and is found to have widespread cancer. Someone has to decide what to do with him. In these situations an ethics board is involved.
Overwhelmingly, these boards tend to favor patient comfort and quality of life rather than length of life and doing things that are extreme. A lot of people who are sick don't want to get extreme treatment for their sickness, but also don't necessarily want to be the one directly refusing. Its very hard to say "I don't want chemotherapy" when its an option to your family and your doctor even if you really don't want it and would rather just live your life out and die in peace. So people take chemo, try it for a while, and then when it doesn't work out die anyway and spend thousands in the process.
Whilst ethics boards only come into play in very unclear cases or cases that are fairly extreme, the concept that review of what is socially acceptable care for patients extremely sick is not evil or wrong and for many patient's and families is seen positively because it takes the burden of very very difficult decisions off their shoulders. The reality is almost all of a person's medical spending occurs in the last 6 months of life. It is not unreasonable to ethically, and compassionately review healthcare costs and efficacy in these situations.