Many people today (whether politicians or Christian leaders) can give great speeches, be inspiring, and do great things politically, however no one really knows their true spiritual condition. It shows that Jesus Christ is the only role model to look at and be able to fully trust. No one else comes close to Him. It's a lesson for the future also, as the Antichrist will be a deceptive messianic/charismatic figure who will capture the hearts of many.
Jeremiah 17:5-8 (NLT):
"This is what the Lord says:
“Cursed are those who put their trust in mere humans,
who rely on human strength
and turn their hearts away from the Lord.
6 They are like stunted shrubs in the desert,
with no hope for the future.
They will live in the barren wilderness,
in an uninhabited salty land.
7 “But blessed are those who trust in the Lord
and have made the Lord their hope and confidence.
8 They are like trees planted along a riverbank,
with roots that reach deep into the water.
Such trees are not bothered by the heat
or worried by long months of drought.
Their leaves stay green,
and they never stop producing fruit."
A quote from an article (Martin Luther King Cheated On His Wife & Other Lesser-Known Facts About The Civil Rights Leader For MLK Day):
"King even spent the last night of his life with a woman who was not his wife. In the chaos outside the Lorraine Motel, his advisers told the young woman to stay out of the ambulance to avoid tarnishing his legacy."
A quote by MLK, Jr. (Martin Luther King, Jr.)-
"He who passively accepts evil is as much involved in it as he who helps to perpetrate it. He who accepts evil without protesting against it is really cooperating with it."
Perhaps, MLK, Jr. was referring to civil injustices when he made that quote. However, he himself failed to uphold that (addressing evil) in regards to his own life, especially sexual immorality.
It's not just MLK, Jr., there have been other inspirational leaders who've made great speeches and quotes, but their lives didn't reflect true godliness, and sadly, now many of them look like hypocrites.
Matthew Henry had an interesting commentary regarding Malachi chapter 2- which applies to modern preachers.
"Here is a record of the judgments God had brought upon these priests for their profaneness, and their profanation of holy things. 1. They had lost their comfort (v. 2): I have already cursed your blessings. They had not the comfort of their work, which is the satisfaction of doing good; for the blessings with which they, as priests, blessed the people, God was so far from saying Amen to that he turned them into curses, as he did Balaam's curses into blessings. That profane people should not have the favour of receiving God's blessings, nor those profane priests the honour of conferring and conveying them, but both should lie under the tokens of his wrath. Nor had they the comfort of their wages, for the blessings with which God blessed them were turned into a curse to them by their abuse of them; they could not receive them as the gifts of his favour when they had made themselves so obnoxious to his displeasure by not laying to heart the reproofs given them. 2. They had lost their credit (v. 9): Therefore have I also made you contemptible and base before all the people. While they glorified God he dignified them and supported their reputation, and a great interest they had in the love and esteem of the people while they did their duty and walked with God in peace and equity; every one had a value and veneration for them; they were truly styled the reverend, the priests; but when they forsook the ways of God, and corrupted the covenant of Levi, they thereby made themselves not only mean, but vile, in the eyes even of the common people, who, the more they honoured the order, the more they hated the men that were a dishonour to it. Their conduct, their misconduct, had a direct tendency to this, and God owns his hand in it, and will have it looked upon as a just judgment of his upon them, and not only produced by their sin but answering to it; they put dishonour upon God, and made his table and the fruit thereof contemptible (ch. i. 12), and therefore God justly put dishonour upon them and made them contemptible; they exposed themselves, and therefore God exposed them. Note, As sin is a reproach to any people, so especially to priests; there is not a more despicable animal upon the face of the earth than a profane, wicked, scandalous minister."
Hypocritical/sociopathic preachers (who pervert the grace of God and turn it into a license to sin) are one of the biggest problems for churches today.