Congressional Republicans would be more willing to stand up to Donald Trump if their major financial backers — big business and Wall Street — had more backbone.

Ever since 1971, when then-future Supreme Court Justice Lewis Powell urged corporations to mobilize politically, corporate money has flooded Washington — most of it into Republican coffers.

Today, big corporations and Wall Street essentially own the Republican Party. In the 2016 campaign cycle, they contributed $34 to candidates from both parties for every $1 donated by labor unions and all public interest organizations combined.

They donate far more to Republicans than do extremists such as the Koch brothers and have far more influence over the GOP than does the Tea Party.

Which means the CEOs of America’s largest firms have the power to constrain the most dangerous, divisive and anti-democratic president ever to occupy the Oval Office.

So why don’t they? What explains their silence?

Consider Jamie Dimon, chairman and CEO of JPMorgan Chase, the largest bank in the United States. Dimon also chairs the Business Roundtable — the most influential confab of major CEOs in America, founded in 1972, just after Powell urged CEOs to mobilize.

Dimon has gone out of his way not to criticize the mad king. While he “strongly” disagreed with Trump’s equating white supremacists to protesters in Charlottesville, Va., last summer, he also counseled “not to expect smooth sailing” in the first year of a new administration.

Now well into Trump’s second year, with the sailing more treacherous than ever — Trump has fired most of the adults around him and grown even more erratic and unhinged — Dimon is even more conciliatory.

Asked this month how Trump is doing, Dimon gushed. “Regulatory stuff, good.” The potential summit with North Korea, a “great idea.” He regrets his 2017 prediction that Trump would be a one-term president, telling Fox Business, “I wish I hadn’t said it, I was talking probabilistically.”

Dimon’s reluctance to criticize Trump is particularly curious given Dimon’s public laments about widening inequality, the explosion of student debt, America’s growing racial divide, the failure of urban schools and the expenditure of “trillions of dollars on wars.”

One obvious explanation is found in the money rolling in from the GOP’s new tax law and Trump’s frenzy of deregulation. Profits have soared at JPMorgan and at other big banks and corporations. Compensation for Dimon and other CEOs has exploded.

Never underestimate the power of a fat compensation package to buy up scruples. From the perspective of Dimon and other CEOs, what’s not to like about Trump and the GOP?

It turns out, plenty. As the Republican Party moves toward Trump’s looniness — his xenophobia, isolationism, attacks on the media and on truth, conflicts of interest, anti-Muslim and racist provocations, climate-change denials, proposed cuts in Medicare and Medicaid, the dismantling of the Affordable Care Act, and the evisceration of the constitutional divide between church and state — Dimon and his ilk could come out big losers.

Let them try to sustain corporate profits as America slides toward authoritarianism. Let them try to maintain comfortable lifestyles as America descends into angry populist tribalism.

Don’t Dimon and other CEOs have a moral responsibility to sound the alarm?

I’m old enough to recall a time when CEOs were thought of as “corporate statesman” with duties to the nation. As one prominent executive told Time magazine in the 1950s, Americans “regard business management as a stewardship,” acting “for the benefit of all the people.”

CEOs of that era formed the Committee for Economic Development to champion causes such as universal pre-kindergarten and campaign-finance reform.

Today’s CEOs finance a larger part of our political system, yet they won’t take a stand to save it.

The socially conscious Committee for Economic Development has withered, while the profit-obsessed Business Roundtable has become dominant (along with its louder cousin, the U.S. Chamber of Commerce).

The corporate statesmen of the mid-20th century have been replaced by sycophantic Dimons of the 21st — at a time when we need statesmen more than ever.

Democracy is fragile. Two weeks ago, Hungary’s far-right governing party, Fidesz, gained a huge victory in national elections, further tightening Prime Minister Viktor Orban’s grip on power, and signaling an end to Hungary’s independent media and a deepening threat to its democracy.

If the leaders of American business remain silent about what Trump is doing to American democracy, they will be complicit in its demise.

© 2018 Robert Reich

Robert Reich, a former U.S. secretary of labor, is professor of public policy at UC Berkeley. To comment, submit your letter to the editor at SFChronicle.com/letters.