I am struggling to handle internal conflict inside me.

[No Vested Interest]

9. I have found that personally, I have to let go of anger to have peace of mind.

Now an elderly woman, I find I just don't have the energy to fight, even internally, others evil intentions, thought and actions.
I just have to protect myself now and leave the rest to the Lord to sort out.
I pray to a number of saints, with different charismas, for assistance and strength. The Sacred Heart of Jesus, His mother Mary, St. Joseph, St. Francis, St. Christopher for physical strength, St. Jude, St. Ann, St. Joan of Arc for courage, and others who have faced challenges.
Perhaps St. Paul could be of particular help in this instance.
I don't think we have to worry re Hitler, Stalin and past despots. Pass them along to a saint/someone who has had experience with that type of "problem" to solve and go about your everyday life in the peace of Christ.
The Lord wants us to find our peace in Him. He is there for us.
Also, Mary, mother of Jesus, who suffered the injustice of the loss of her Son. - She knows the pain you are suffering.
The Memorare - "Remember, O most gracious Virgin Mary, that never was it known that anyone who fled to your protection was left unaided,..
Peace be with you, my friend..