Why people do not take Doctor's orders seriously especially when taking mental medication?

I work in a metal institution. I had to deal with some very difficult people when they don't take their love ones mental health seriously. I had a people going off on me and the doctor who I work for complain claiming their love one does not need medication. We have a lot off olderly people with dementia later to have their family member come back asking for the doctor to prescribe medication. My question is how dangerous does the issue need to be for people to take their love one's mental health seriously?

Why people do not take Doctor's orders seriously especially when taking mental medication?
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