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Well, state and federal laws reflect the learned and thoughtful application of knowledge to societal issues. (We hope, anyway! Let's pretend.) Passage of laws is intended to be long, onerous, and requires compromise and consensus. The ideas for laws need to be thoroughly vetted.
When one family believes it is their right to reject and disregard those laws, and demand to substitute their own ideas, we have an issue. And when that one family chooses to go about forcing their agenda and disregarding laws, particularly when the family is actively recruiting harassment and civil disobedience on the grounds of a pediatric hospital, then yes, I do believe that it does matter what a whole lot of people feel about it.
There are proper ways to go about changing laws. The law says doctors diagnose death in accordance with a lot of medical standards, and wrt state statutes. Ordinary people don't get to demand that they have the entitlement and the "right" to re-define what is in state law whenever they want, to suit their own personal circumstances. They are free to "believe" anything they want, but their behavior must be in conformity with state law.
In another thread, I gave the example that someone might "believe" that honor killings are right and justified. In certain parts of the world, honor killings are legal. However, if one engages in honor killings here in the U.S., they would be guilty of murder one.
So yes, in this case, the family has actively recruited public opinion. Many times per day the uncle and the attorney actively seeks out and engage social media, and mainstream media about the circumstances of Jahi McMath and her family. They trash a world class institution over and over, and we only have ONE side of the story, since the hospital cannot speak or defend their actions and their care. So yes, it matters, IMO, what a whole lot of people think about that.