I definitely have a theory on why this happens but at work and don't have time to share. Like my post to remind me and I will share ( I need to cite to several Bible verses). In summary, I think the Devil and demonic entities are behind it all.
So McDad, here is my theory on why people in power are so corrupted and evil.
First off, I believe in the Devil and Demons. Based on the verse below, they are very much on this Earth. Hell doesn't exist yet according to Christian Lore and won't until judgment:
I: Peter chapter 5: 8-9
8Be sober, be vigilant; because your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour: 9Whom resist stedfast in the faith, knowing that the same afflictions are accomplished in your brethren that are in the world.
In the Bible, it is recording often that people can get possessed or even tempted to evil by devils. There is also an interesting story in Ezekiel. It is found in Ezekiel 28. I am not going to post as the entire chapter is relevant but here is the link:
Ezekiel 28 KJV
Clearly when Ezekiel is prophesying to the King of Tyre, it gets into language that sounds like it has nothing to do with a local ruler. Here are some exerts:
Thou hast been in Eden the garden of God verse 13
Thou art the anointed cherub that covereth; verse 14
Thou wast perfect in thy ways from the day that thou wast created, till iniquity was found in thee. verse 15
Basically Ezekiel talks to this ruler as if it is God talking to Satan according to most descriptions. This, to me, indicates that Satan was in control (either by influence or even direct possession of this King).
Then there is a well known Bible story about Jesus' temptation in Luke Chapter 4.
5 The devil led him up to a high place and showed him in an instant all the kingdoms of the world. 6 And he said to him, “I will give you all their authority and splendor; it has been given to me, and I can give it to anyone I want to. 7 If you worship me, it will all be yours.”
8 Jesus answered, “It is written: ‘Worship the Lord your God and serve him only.’[c]”
Most people don't ponder on one reality about this specific temptation. The devil HAD THE POWER to give Jesus control of the world. I don't think this was some frivolous offer. Had Jesus said "yes", the Devil cold have given Him the World.
Then there is this verse in Ephesians 6:12
12 For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places.
There is more that I can continue to point out from the Bible. It is clear that the Devil and his demons are here in the world. It was the authorities that killed the prophets in the Old Testament. Ever King of Israel and most of the Kings of Judah were wicked and followed not God. It was the authorities that had Jesus crucified, his apostles persecuted, and inflicted horrors on the early church.
Often, people in power, will even behave illogically at the expense of defying God. I truly don't think these people even know why they support evil, it is put into them.
Why is every song and song artist lyrics about trash and ever focus on indecency from the entertainment industry?
Why is Christianity either persecuted or miss-used for evil by most Government entities throughout history?
Why defend LGTBQ+ stuff if not to defy God? It gives you very little political points, LGTBQ+ can't reproduce and truly don't offer anything tangible to humanity.
Why cover up priests molesting children in the Catholic Church if not for the intervention of something sinister.
It all comes down to the fact that there is a real spiritual war out there. There isn't some cabal of humans running this stuff like Qanon said. It isn't Jews like Dobbs4Heisman is railing about. It is people being influenced by darker powers that even they may not understand.
If we were honest about America, the greatest tragedy we face as a nation is that we have countless millions dying every year that are standing before judgment and being sent to Hell because they were deceived their entire life by lies that were likely originated and started by the Devil.