God chose Mao, Stalin and Hitler to rule over men, right?

 

Here is Saint Augustine, “City of God.” Book 5

Chapter 21.— That the Roman Dominion Was Granted by Him 

from Whom is All Power, and by Whose 

Providence All Things are Ruled.

These things being so, we do not attribute the power of giving

 kingdoms and empires to any save to the true

 God, who gives happiness in the kingdom of heaven to the 

pious alone, but gives kingly power on earth both 

to the pious and the impious, as it may please Him, whose

good pleasure is always just. For though we have 

said something about the principles which guide His 

administration, in so far as it has seemed good to Him to

 explain it, nevertheless it is too much for us, and far surpasses 

our strength, to discuss the hidden things of

 men’s hearts, and by a clear examination to determine the 

merits of various kingdoms. He, therefore, who is the

 one true God, who never leaves the human race without just

 judgment and help, gave a kingdom to the Romans

 when He would, and as great as He would, as He did also to

 the Assyrians, and even the Persians, by whom, as 

their own books testify, only two gods are worshipped, the one 

good and the other evil — to say nothing 

concerning the Hebrew people, of whom I have already spoken 

as much as seemed necessary, who, as long

 as they were a kingdom, worshipped none save the true God. 

The same, therefore, who gave to the Persians 

harvests, though they did not worship the goddess Segetia, who

 gave the other blessings of the earth, though 

they did not worship the many gods which the Romans supposed 

to preside, each one over some particular

 thing, or even many of them over each several thing — He, I say,

 gave the Persians dominion, though they 

worshipped none of those gods to whom the Romans believed

 themselves indebted for the empire. And the 

same is true in respect of men as well as nations. 

He who gave 

power to Marius gave it also to Caius Cæsar; He

 who gave it to Augustus gave it also to Nero; He also who gave 

it to the most benignant emperors, the 

Vespasians, father and son, gave it also to the cruel Domitian; and,

 finally, to avoid the necessity of going over 

them all, He who gave it to the Christian Constantine gave it also to 

the apostate Julian, whose gifted mind was 

deceived by a sacrilegious and detestable curiosity, stimulated by 

the love of power. And it was because he was

 addicted through curiosity to vain oracles, that, confident of

 victory, he burned the ships which were laden with

 the provisions necessary for his army, and therefore, engaging 

with hot zeal in rashly audacious enterprises, he 

was soon slain, as the just consequence of his recklessness, and

 left his army unprovisioned in an enemy’s 

country, and in such a predicament that it never could have escaped, 

save by altering the boundaries of the 

Roman empire, in violation of that omen of the god Terminus of 

which I spoke in the preceding book; for the god

 Terminus yielded to necessity, though he had not yielded to Jupiter.

 Manifestly these things are ruled and 

governed by the one God according as He pleases; and if His motives

are hid, are they therefore unjust?

Job 34: For when he granteth peace, who is there that can condemn? 

When he hideth his countenance, who

 is there that can behold him, whether it regard nations, or all men?

 

[30] Who maketh a man that is a hypocrite

 to reign for the sins of the people?

Haydock Commentary: Ver. 30. People. A hypocrite  denotes

 one infected with all sorts of crimes. S. Iræn. v. 24.

 Such a king is  sometimes given to punish a wicked people. 

Ose. xiii. 11. Isai. iii. 4.