In the Old Testament the book of Kings tells the history of the different kings that ruled the nation of Israel (beginning from Saul, who was the first king, and ending several hundred years later with Zechariah, who was the last king).
The introduction of a king ended up dividing Israel into two kingdoms. There was the kingdom of Judah in the south (2 tribes) and the kingdom of Israel in the north (10 tribes).
This division of the Kingdom demonstrates that worldly kings are not able to unite a nation. On the contrary they cause division.
None of these kings were perfect. Some were better than others, but they all had flaws.
It was not really God's will for the nation of Israel to have a king.
Moses was not a king, he was a prophet, the mouth-piece of God. But on reaching the Promised Land, some 40 years after Moses had led them out of Egypt where they had been enslaved for 400 years, Israel envied the other nations around them that had kings, and they asked God for a king.
Saul was the first king. David succeeded Saul. Then followed Solomon, and then his son, Rehoboam. It was at this point that the kingdom divided in two.
David was a flawed individual. For example, he committed adultery with Bathsheba and arranged for her husband, Uriah, to be placed at the front of a very fierce battle so that he would likely get killed, and he did.
Despite his flaws, David is considered to be the best king of them all, and ever since King David, Israel looked back at his reign as the Golden Age, and looked forward to a new Golden Age when another king like David will reign, a son of David.
Christians believe this person eventually arrives several hundred year later. His name is Jesus Christ.
But Jesus was not the kind of king that Jewish Israel was expecting. Jewish Israel was expecting a worldly king, but Jesus said 'my kingdom is not of this world'.
As the story goes, Jesus was not flawed like all the other kings. He was a perfect person, there was no sin in him. His sword was not a physical weapon. His goal was unity.
So the message for me from this is that all kings and political leaders are flawed people, sinful individuals.
'All have sinned and fall short of the glory of God' (Romans 6:23).
A nation may put up a monument to remember their political leaders, because they were significant movers of history.
"The Anarchists are right in everything; in the negation of the existing order and in the assertion that, without Authority there could not be worse violence than that of Authority under existing conditions. They are mistaken only in thinking that anarchy can be instituted by a violent revolution. But it will be instituted only by there being more and more people who do not require the protection of governmental power and by there being more and more people who will be ashamed of applying this power." - Tolstoy