Opinion | He’s No Jack Kennedy

This maternal wisdom proved painfully on point for poor Jeb. And, several years on, the Republican Party has gone all in on trashing “professional politicians” — or pretty much anyone with a clue about or an interest in how government works. The more ignorant and unqualified you are, the more the base loves you. (See: Marjorie Taylor Greene.)

Still, no one is entitled to any elective office by virtue of their birth. That said, there is a case to make in appreciation of candidates who hail from families that take public service seriously and who are familiar with the weird world of politics. Exhibit A is Nancy Pelosi, the most formidable and effective House speaker in more than 60 years, who learned much about her craft growing up in a local Democratic dynasty in Baltimore.

Plenty of Americans follow their families into a particular field, be it the military, law enforcement, teaching, acting or journalism. So if George P. Bush wants to run for this or that office in his home state of Texas, more power to him. And if voters choose to smack him down, as they did in the Republican primary for state attorney general last year, good on them. (Although sticking with Ken Paxton instead? Really?)

But there is a dark side to all of this. Certain dynastic players can begin to feel — and behave — as though they are entitled to elected office, treating the honor as if it is not something to be earned so much as handed down like a family heirloom or a dry-cleaning business. That way inevitably leads to trouble.

Just as problematic, and far more common, is when voters treat a well-known political name as a substitute for seriously vetting a candidate’s fitness for office. As one poll respondent mused to CNN about the colorful Mr. Kennedy: “I liked his dad (R.F.K.) and his uncle (J.F.K.) a lot. I would hope he has a similar mind-set.” Woo, boy. Cross your fingers that this voter does some due diligence before casting a ballot.

Being born into a political family doesn’t magically make you qualified for office. As the scholar Stephen Hess, who literally wrote the book on America’s political dynasties, has pointed out, the offspring of these high-powered clans all too frequently turn out to be extremely … problematic. At the risk of sounding harsh, for every Beau Biden, there is a Hunter.

Seriously, if you think Mr. Kennedy’s presidential aspirations are troubling — and you should — best start trying to wrap your mind around what a Trump dynasty could look like. Governor Ivanka? Senator Jared? President Don Jr.? Mock if you must. But spend a minute on the campaign trail with Don Jr. and it’s clear he has developed a taste for it. And voters in the Republican base love him.