Actor Jim Carrey arrives at LACMA's 50th Anniversary Gala at LACMA on April 18, 2015 in Los Angeles.
Axelle/Bauer-Griffin—Getty Images
By Jeffrey Kluger
July 2, 2015
IDEAS
Kluger is Editor at Large for TIME.

Say this for the anti-vax clown car: it never seems to run out of new punchinellos to climb inside. If it’s not scientific fabulist Andrew Wakefield, he of the fraudulent study that got the whole vaccine-autism myth started, it’s Jenny McCarthy, she of the supposedly vaccine-injured son whose autism was cured in part by—yes!—a gluten-free diet because, um, gluten is bad, very bad.

After McCarthy, there was Saturday Night Live alum Rob Schneider—because when you’re looking for guidance on the wisdom of vaccines, who are you going to trust: the World Health Organization, the Centers for Disease Control and the National Institutes of Health, or the man who gave us Deuce Bigelow, Male Gigolo? I mean, hello, the movie was huge.

Now, to this group of board-certified jesters add Jim Carrey—the ex-Mr. Jenny McCarthy—who rose on July 1 in all his orange-wigged, floppy-shoed, seltzer-down-the-pants fury to condemn California Governor Jerry Brown for the high crime of common sense, after Brown signed a law that requires virtually all kids in the state to be fully vaccinated as a pre-condition for attending public school. Carrey took—no surprise—to Twitter to air his peer-reviewed views.

“California Gov says yes to poisoning more children with mercury and aluminum in manditory [sic] vaccines. This corporate fascist must be stopped,” said the erstwhile Ace Ventura, Pet Detective. That was followed by:

“They say mercury in fish is dangerous but forcing all of our children to be injected with mercury in thimerosol [sic] is no risk. Make sense?” Which was followed by:

“I am not anti-vaccine. I am anti-thimerosal, anti-mercury. They have taken some of the mercury laden thimerosal out of vaccines. NOT ALL!”

And there was more too, but really, it doesn’t matter. Never mind that Carrey does not understand the difference between ethylmercury and methylmercury or the fact that there is virtually no mercury of any kind left in vaccines. Never mind that he doesn’t seem to know that to the extent that aluminum is in vaccines at all, it is there only as an adjuvant—or immune system stimulant—and is well-handled by the body, especially in the trace amounts that it’s found in vaccines. And never mind too that if you’re going for the ad hominem attack—a staple of anti-vaxxers—calling a man like Jerry Brown, better known as Governor Moonbeam, a “fascist” is a bit wide of the argumentative mark.

The anti-vax crowd has never been about reasoned argument or a cool-headed look at clinical science. They’ve been all about rage, all about echo-chamber misinformation. For every sensible action to boost vaccination rates, they have long been there, like a sort of perverse bit of Newtonian physics, with an equal and risible reaction.

Maybe that’s the reason they roll out pratfall comics like Schneider and Carrey to plead their case—a bit of misdirection to hide the tragicomedy of their message behind the larger comedy of the messenger. Or maybe they’re the best they’ve got.

That matters. A movement that begins with a study conducted by a doctor so thoroughly discredited that he’s not even allowed to practice medicine in his native United Kingdom anymore (Wakefield) and takes flight thanks to the prattlings of a Playboy model and talk show guest (McCarthy) ought not to have a chance against the informed scientific opinion of virtually every medical group on Earth. That it does says something about the hucksters’ ability to sell their nonsense and the human tendency to pay more attention to famous but wrong-headed people than to unglamorous but smart ones.

But that’s finally changing. The anti-vax act has at last gotten old, and it’s gotten tired and the cost—sick children, lost school days, outbreaks of diseases like measles, mumps and whooping cough—has gotten too high.

Like all fringe groups eventually do, the anti-vaxxers are now entering their rump-faction stage, dwindling to an angry, dense, immune-to-reason core. Soon enough, they’ll be gone. The likes of Carrey—today’s foghorn, tomorrow’s footnote—will vanish with them. And America’s children—not for nothing—will be better for it.

Read next: California Governor Jerry Brown Signs Mandatory Vaccine Law

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