It is just because civilization is ever evolving, changing, and becoming more complicated, that experts find it so difficult to define it in explicit terms. ↗
As a medical doctor, it is my duty to evaluate the situation with as much data as I can gather and as much expertise as I have and as much experience as I have to determine whether or not the wish of the patient is medically justified. ↗
I have a lot of nice Italian winter clothes that make me look like a sophisticated Lebanese professor, so my friend Robert and I go around pretending to be experts in Arabic politics. It doesn't work in the summer though. I don't have the right clothes. ↗