Biologically and psychologically, human beings have not changed. The primitive drivers of human behavior—survival instincts, the quest for dominance, tribalism, and fear of the unknown—remain exactly the same as they were in ancient Greece.However, modern society handles this extremism differently because our legal, ethical, and institutional structures have evolved to suppress physical violence.The ways modern extremism mirrors the past, along with the key differences in how it manifests today, include:How People Are Still the SameTribalism and Group Identity: Just like the Pythagoreans fiercely protected their mystical mathematical worldview, modern groups form rigid, echo-chamber communities around specific ideologies, politics, or belief systems.Hostility Toward Disruptive Truths: When an established worldview is challenged, the initial human reaction is often anger and exclusion rather than open-minded curiosity."Keyboard Assassinations": While physical violence over academic theories is illegal, extreme hostility has shifted online. Modern scientists, public figures, or researchers who publish controversial or counter-narrative data frequently face intense online harassment, death threats, and attempts to ruin their careers or reputations ("canceling").Why Society Believes It Is DifferentThe Rule of Law: In ancient Metapontum, a cult could allegedly throw a man into the sea with impunity. Today, institutional legal systems universally prosecute physical violence, protecting intellectuals from bodily harm regardless of how offensive their ideas might be to certain groups.Institutionalized Dissent: Modern science is explicitly structured to reward the peaceful overturning of dogma. If Oxford physicist Tim Palmer's Rational Quantum Mechanics theory successfully proves that quantum mechanics is built on a mathematical fiction, he will not be executed; he will likely win a Nobel Prize.Apathy vs. Aggression: Interestingly, some modern sociological research suggests that rather than violently fighting new ideas, large segments of modern society suffer from "apathy"—becoming so overwhelmed by an influx of constant digital information that they struggle to care deeply about major paradigm shifts.While human nature still possesses the same Capacity for cruelty and fanaticism, modern civilization has built safeguards to ensure that when paradigm-shifting "heresies" occur, they are fought with math, data, and peer-review, rather than drowning.