“How dare you?”

Remember that fiery 2019 United Nations speech, when a 16-year-old Greta Thunberg stared down world leaders and accused the adults in the room of stealing her future by ignoring climate change?

The moment catapulted the perpetually pinch-faced teen towards unfathomable stardom as a self-anointed champion for human rights and the planet’s survival.

But fast-forward to today, and Greta is falling quite short of that promise.

She’s not a savior — in fact, she’s a malignant force trying to erase the horrors inflicted on some of the world’s most vulnerable, the victims of Hamas’ Oct. 7 massacre.

How can someone who built her life around securing youth a future be so hell-bent on obliterating the past, silencing Jewish voices and denying the suffering of children burned alive, women raped and families slaughtered?

Let’s look at her latest escapades.

Just last month in London, Thunberg was detained under Britain’s Terrorism Act for supporting hunger-striking members of Palestine Action, a group the government proscribed last year.

Holding a sign reading, “I support Palestine Action prisoners. I oppose genocide,” she openly legitimized a terrorist organization.

This can no longer be shrugged off as youthful rebellion; it is a glaring absence of any moral compass.

Nothing is beyond the pale for her, no alliance too toxic, no atrocity too inconvenient to ignore.

Greta has become a weaponized vessel of the far left, deployed against Jews, against Israel, against Western democracy itself.

But supporting terrorists is just the beginning.

Thunberg co-signed an open letter in October from more than 300 writers, activists and politicians, including Squad member Rashida Tlaib and Irish writer Sally Rooney, pledging to boycott The New York Times over its coverage of Hamas’ atrocities.

The group accused the paper of “anti-Palestinian bias” and demanded it retract its December 2023 investigative piece “Screams Without Words,” which detailed the systematic sexual violence Hamas committed during the 2023 attacks.

This was a direct call to suppress and erase evidence of those barbaric crimes, labeling the report “widely debunked” despite its reliance on eyewitness accounts and forensic details.

By pushing to bury this documentation of rape as a weapon of war, Thunberg is unabashedly demanding censorship of Hamas atrocities that left Jewish women brutalized and families shattered.

How dare you, Greta?

And in June, Thunberg joined a so-called freedom flotilla to Gaza, a publicity stunt masquerading as aid delivery. Intercepted by Israeli forces, she and her crew refused to watch Oct. 7 footage, the same barbaric acts detailed in the Times report.

Thunberg didn’t just look away — she aligned with pro-Hamas narratives to downplay or deny these crimes, effectively demanding the world forget more than 1,200 dead and countless more traumatized civilians in Israel.

The stunted Thunberg manufactures an illusion of deity, a modern Joan of Arc fighting for justice and peace, but her path is littered with division and destruction.

She sets fires ahead and leaves a warpath behind, all while claiming to champion human suffering worldwide.

But what fuels this twisted judgment? A strictly vegan, purely ideological diet may be partially to blame.

Thunberg, who is autistic, has been vegan since age 10, shunning all animal products without exception, from milk to eggs to honey.

That’s more than a decade of depriving a developing brain of essential nutrients like omega-3 fatty acids, vitamin B12, iron and zinc, key for cognitive health, especially in those with neurological vulnerabilities.

Research shows vegan diets can lead to deficiencies that impair brain function, mood regulation and even social cognition.

For someone with autism, this is a double whammy: an innate brain difference compounded by ideological eating that starves the mind of healthy fats needed for growth and introspection.

Studies on “ideological food choice” reveal how vegans often tie their diets to identity politics, normalizing extreme views in echo chambers where there is no nuance.

Thunberg embodies this, trapped in a bubble of small thinking, unable to grasp history’s complexities or her role as a pawn in progressive causes.

She’s never matured past a child’s grandiose whims, those black-and-white ideals that ignore context and triangulation.

Without proper nourishment, her vulnerable brain hasn’t developed the capacity for thoughtful analysis, leaving her susceptible to manipulation.

Greta has good company in her vegan-fueled extremism.

Take the French anti-meat activists sentenced in 2019 for vandalizing butchers and restaurants, their ideology turning dietary choice into violent crusade.

Or the Animal Liberation Front, labeled ecoterrorists by the FBI for arson and threats, where vegan purism devolves into criminality.

And it’s not surprising: A 2005 case of five siblings on a raw vegan diet showed growth delays and rickets, underscoring how such restrictions can physically and mentally hinder development.

Thunberg is no hero.

She should serve as a warning to parents raising kids captured by an ideology, whether food, politics or otherwise.

Raised in a family that affirmed rather than challenged her eccentricities, she’s the product of intense coddling with consequences that affect us all.

At 22, the 4’11” woman-child continues to push far-left agendas that endanger the very democracy and human rights she purports to fight for.

Scarier still, Greta inspires young people to become trapped in the omnicause activist-industrial complex, embodying the threat to our collective future she originally warned us about.

How dare you, Greta?

The real question is: How dare we let her?

Natalya Murakhver is a co-founder of Restore Childhood and director of the documentary “15 DAYS: The Real Story of America’s Pandemic School Closures.”