Charlie Munger once said he might have ended up on the political left if he'd witnessed firsthand the brutal conditions coal miners endured in earlier generations. It's a striking admission from someone raised in a deeply conservative environment.

During a 2017 interview at the University of Michigan's Ross School of Business, the late Berkshire Hathaway vice chair opened up about his childhood in Omaha. He described being raised by people who believed firmly in self-reliance, were skeptical of welfare programs, and valued "hard money" like gold over government-backed currency.

Those views might sound old-fashioned today, but Munger never regretted his conservative upbringing. He felt it served him well throughout his life, even if it seemed "backward" by contemporary standards.

But there were limits to his ideological certainty. Munger had a liberal aunt who wrote her thesis on emissions in coal mines, and he described her as a "screaming leftist." His take on her politics was surprisingly empathetic.

"I would be a screaming leftist if I observed the way the coal miners of yesteryear were treated, you couldn't be a human being with any decency on you without feeling that it was deeply improper to have the misery that great," he said.

Guarding Against Self-Deception

Munger's aunt used to send him left-wing books, which he admitted he dismissed at the time. He thought she was a bit of a "nut" whose worldview sometimes distorted her grasp of reality. But that observation led him to a broader point about thinking clearly.

The real danger, Munger warned, is letting any ideology cloud your judgment. He told the audience the "whole trick" in life is to never let your own mind deceive you with faulty assumptions about how the world works.

The Value of Being Judgmental

In his younger years, Munger was quick to notice flaws in people, even those he admired. He could see where successful people were "nuts" and made a point of avoiding those patterns himself. More importantly, he kept adjusting his judgments as he learned more.

"I was not a prodigy or anything like that but I was a prodigy in having adult interests," Munger said. "I was very judgmental and I think that helped me, I kept changing my judgments as I learned more and more facts came in. That created lifelong habits that were very, very useful."

Another formative influence was his paternal grandfather, a federal judge who believed rationality was a moral obligation. His grandfather thought it was your duty to become as "unignorant" and "unstupid" as possible, and he had little patience for people who didn't share that commitment.

"He really believed that rationality was a moral duty and he worked at it and he scorned people who didn't do it," Munger recalled.

It's classic Munger: a willingness to question his own assumptions, learn from difficult realities, and constantly refine his thinking. Even someone raised in a world of gold-standard conservatism could recognize injustice when he saw it.