Stupidity and foolishness know no bounds. They don’t respect any of us. 
The other day I was doing some computer work and the ID channel was on. It’s the channel crime mystery lovers watch. A show about the murder of a woman was on. Turns out her husband, an MIT educated guy with a Ph.D. did it. I caught enough of the program to tell it was one stupid decision after another that climaxed with him killing his wife. I was thinking what most of us always think when we hear such things, “How can a guy who is so smart be so stupid?”
Because we all have a tremendous capacity for stupidity and foolishness. Even the smartest and wisest leaders can make stupid choices. 
Many people appropriately admire the goodness or greatness of General George Patton. But quite often this brilliant general was known to jam his foot firmly into his mouth. Many leaders have allowed their ego (or something else) to override their senses. It happens. 
Last night CBS 60 Minutes’ Anderson Cooper interviewed Stormy Daniels, the porn star who claims to have been intimate with Donald Trump. Lots of discussions have ensued about leaders and U.S. Presidents who have been guilty of “indiscretions.” Indiscretions? Well, that’s being polite. Sort of like calling Ms. Daniels an “adult film” star is a polite way of saying she’s a porn star. President Kennedy wasn’t the first (and he did it while in office), nor will Trump be the last. Smart men behaving foolishly. 
I don’t care what your politics are. Or what color the state is where you live and work. It doesn’t matter to me. And notice I’ve not said anything about “great leaders.” That’s likely far more subjective than smart. Whether you loved Kennedy, Clinton or Trump. Or hated them. These (and many others) are inarguably smart guys who were able to achieve some success in life prior to being elected President, which requires a certain degree of smartness. 
Really smart people – smart leaders (people who are at the top of the food chain in an organization) – can be stupid and make really bad choices. Rather than throw rocks, what can we learn to help our own leadership? It’s a loaded question and there are likely as many reasons as there are people and situations, but let’s give it a go and try to learn some things.
Selfishness Trumps Them All
Pun intended. 
Every single act of foolishness and every stupid choice can likely be traced all the way back to selfishness. The leader was primarily (maybe only) thinking of himself. 
General Patton, like many other leaders, could blurt out things that others found appalling. In each case, he was thinking of what he wanted to express, or maybe spewing out thoughts he had been harboring for a long time. Sometimes it may have been an expression of frustration. No matter. It was about him.
From infidelity to immorality to murder, smart people and smart leaders can become so focused on themselves they lose sight of wisdom. Good judgment leaves them as they grow increasingly focused on what they want. 
I’m a baby boomer. I grew up knowing one thing about leadership. It’s service. The phrase “servant leadership,” is credited to Robert K. Greenleaf who wrote about it in 1970. Sorry, Bob, but you did not invent it. Jesus exemplified it. It’s as ancient as time itself. I thought it was the only kind of leadership worth exercising. For me, as a young leader (decades ago), it was THE way to lead. The other option was a dictatorship, which meant being an autocrat. And I’ve always hated autocracy. 
Patton loved his army and his men. Yet, in a self-centered moment, he could behave like a mad dictator. So can you. 
And in one fell swoop, you can undo years of good.