Just my thinking here...
Science comes to a end conclusion after repeated testing. Data can be repeated, and the theories can change. Also, with the new research being done and clinical trials science changes each and every day.
I believe that as human beings we all have common sense to some degree - some more than others (think of those who are mentally ill, have head injuries, or have other health issues). So for the most part, most folks can reason out any decision that needs to be made should the situation come about.
We all also must consider each person has their own perceptions, own belief system, and own priorities. Not everyone will ever answer the same when faced with say a terminal illness.
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