White people who have never been around black people are more likely to hold racist views. Straight people who have never been around out gay people are more likely to hold homophobic views. MLK understood that to change the image of black people as dangerous, he had to get black people shown behaving peaceably on TV. Harvey Milk understood that to change the image of homosexuals as foreign and strange, he had to show people that gays were their siblings, their children, their neighbors. What makes you think that social media has so fundamentally changed humanity?

Trump is president, the American Nazi party is growing, the most popular news network in America is Fox News, the anti-vax movement is growing; and the primary evidence that deplatforming works seems to be a study that shows that bigots left Reddit and declares victory, completely ignoring that Voat started at the same time. If you want evidence, where's yours?