“Why should a standard be expected from a civic leader since no one is perfect?”
There are 4 minimum expectations or standards that are presented in the Scripture for civic leadership. There are actually three locations for these qualifications (Exodus 18:21; Deuteronomy 1:13, 16:18-20) in much the same way there are two locations for elder qualifications for the church. These are not standards (necessarily) for salvation status, but would obviously be most easily demonstrated in a regenerate person. In much the same way the character qualifications of an elder (I Timothy 3, Titus 1) do not necessarily define a nascent Christian, however they certainly provide a maturity standard which demonstrates the reality of salvation and a life a sanctification.