IIRC, part of the argument against is that you're allowing biotech/pharma companies to test on vulnerable populations. Here's a story on NPR about the pros and cons: https://www.npr.org/sections/health-shots/2017/03/03/5177969...
2. You weren't dying before, but you are now.
3. Not dying, but the extreme agony is back.
4. Still not dying and no pain, but you now look like one of the aliens from Close Encounters. Career choices are limited.
...
Well that does sound like a good reason for Congress not to sign on the dotted line, given the definition of 'it'.