What can we learn from this verse?Therefore, if it were possible that you could have just men to be your kings, who would establish the laws of God, and judge this people according to his commandments, yea, if ye could have men for your kings who would do even as my father Benjamin did for this people—I say unto you, if this could always be the case then it would be expedient that ye should always have kings to rule over you.
Good government, righteous government, is that government which will “establish the laws of God, and judge [the] people according to [God's] commandments”.
It doesn't matter so much the system or form of government, be it a monarchy, democracy, republic, etc... the form of government is simply a "TOOL". This verse tells us “it would be expedient that ye should always have kings to rule over you”… yes that’s right... Kings. Hence, so many references in our scriptures to God’s “Kingdom”, and the Patriarchal order within that Kingdom, and the promised blessings for the faithful to become Kings and Queens, Priests and Priestesses. That is God’s order of things.
The problem is not with the idea of a king, or whatever form of government, the problem is us, the natural man, and our tendency to immediately exercise unrighteous dominion when given a little power (see D&C 121). Therefore “because all men are not just it is not expedient that ye should have a king or kings to rule over you.”
And for this reason the Lord has given us today a constitutional republican form of government, with judges and representatives, and so on, similar to the system of judges of the days of Moses and Alma, etc… not because it’s the way Heaven operates, but because it’s the system best suited for men who tend to exercise unrighteous dominion. (And we’ve messed that up too!). A republic is the form of government that takes us the longest to mess up! )
Now back to the main point I'm hoping you'll get from this post...
Good government, righteous government, the best government, is that government which will “establish the laws of God, and judge [the] people according to [God's] commandments”. That's part of our test here on earth.