Should your kids go to Harvard? Many parents have their doubts — and liberals seem to be shocked.

Last week Transportation Secretary Sean Duffy made the question go viral.

Duffy and his wife Rachel Campos-Duffy, in a clip from their YouTube series about their family’s travels, were seen discussing whether their teen daughter Paloma should apply to Harvard University, in light of the importance of their Catholic faith and the values they’ve instilled in her.

“The idea of dropping her off at a place that would undo all of those things makes me worried,” Campos-Duffy says.

The pushback was immediate: At the Los Angeles Times, Lorraine Ali called the conversation “truly disturbing.”

On CNN, former Biden administration official Meghan Hays said the conversation was “offensive and a little self-righteous.”

It appeared to be the first time that leftists had encountered the fact that millions of parents — conservative, moderate and even some rational liberals — worry colleges have become indoctrination factories.

But for the rest of us it’s nothing new.

Three years ago, when Bethany Mandel and I published our bestselling book “Stolen Youth,” about the leftist indoctrination of children in every facet of their lives, parents would often come up to us, tears in their eyes, telling us how they’d “lost” their children when they went away to college.

The kids got to school and were pushed to conform with every leftist idea.

Supporters of Palestine gather at Harvard University to show their support for Palestinians in Gaza at a rally in Cambridge, Massachusetts, on Oct. 14, 2023. AFP via Getty Images

Heartbreakingly, many eventually cut off their parents for their wrongthink.

So the Duffys are absolutely right to worry.

And it’s hardly a new thing: During my own college years in the late 1990s, everyone knew even then that regurgitating leftist ideas would boost your grades in certain classes.

I wrote a paper about how the family was an outdated concept — a tripe I never actually believed — and got my A.

Now I have teenagers myself, and college is very much on our minds.

Like the Duffys, our family talks about which schools are off the list for us.

Our kids are free to choose whatever school they want — but they know we aren’t paying for a school like Columbia, where Jewish kids had to sue the administration to get a “safe passage liaison” for their physical protection.

Harvard is also out: It has catered to a leftist fringe, and the school has been subsumed by it.

Way before “Woke 1,” Harvard was the breeding ground for extreme far-left ideas.

When Jada Pinkett Smith gave a speech at Harvard in 2005 and talked about how women “can have it all — a loving man, devoted husband, loving children, a fabulous career” — she got instant grief.

Her bland proclamation sparked angry internal meetings and critical Harvard Crimson columns for being “heteronormative.”

This was over 20 years ago. Has Harvard gotten more or less sane since?

Harvard tried to get rid of single-sex groups, including fraternities and sororities, until federal courts forced it to lift the ban.

It uses its massive endowment to fight political battles, such as opposing fossil fuels and boosting DEI.

Harvard frequently gets an F in the Foundation for Individual Rights and Expression’s annual rankings for free-speech protection on campus.

No wonder: FIRE’s data found that 79% of Harvard students are OK with shouting down a speaker and 32% saying it’s acceptable to use violence to block a speech.

Yet Claudine Gay, Harvard’s former president, wasn’t sure if calling for the genocide of Jews would violate university rules — and only had to step down when she was found to be a plagiarist.

There’s no data on how many kids go off to college and become radicalized beyond recognition, but everyone knows the stories.

Parents can’t be blamed for not wanting to chance that.

(And if progressives are really puzzled at that, they should imagine if the reverse were true, and their kids were coming home from college as freshly minted conservatives — think of the uproar then.)

Could my kids survive it? Could they tell their professors what they want to hear and stay quiet through the pressure to conform?

Sure. But why do that to them?

And why risk losing your child to a failed ideology that your family opposes?

There’s a reason why Southern schools have become so much more popular in the last few years — and why colleges like Dartmouth, Vanderbilt and the University of Chicago have championed free speech as an important value on their campuses.

Many parents, of all political affiliations, are looking at what so many of America’s top-tier schools offer and saying no, thanks.

Karol Markowicz is the host of the “Karol Markowicz Show” and “Normally” podcasts.