The only thing in this world that conquers sin is the grace of Jesus Christ. Therefore nothing else can change politics but that.
How does our King rule in His earthly Kingdom? Because His Kingdom does exist, and has existed in this world for two thousand years in every nation. It's here now.
Here is the King, seated in His tabernacle throne. Unlike earthly rulers, you can come and visit Him any time you want or need. He's always close to you. Any Catholic Church in the world: there He is.
The thing is, He's not like other earthly kings, because He doesn't have the same focus. So you bring Him your concerns about politics and worries in the world, and He says, "What are you worried about? Those aren't the real issues. Sin is the problem. Not suffering. Sin." And we get those two things mixed up. We think suffering is the problem in the world. Actually, suffering is the solution.
And that's what He teaches us. Our King shows us that our real power through our union with Him in the sacraments, comes through the cross. That's how He redeems us. Not by any of His miracles, not by any of His profound preaching and teachings, but through His passion and His death. That's how He changes the world.
And don't think for a moment that it's any different for you and me. You want to change society?
2 Sm 7:1-5, 8b-12, 14a, 16; Ps 89:2-3, 4-5, 27, 29; Rom 16:25-27; Lk 1:26-38