But to seriously answer the OP, you can't. At least the ones that are 25-30+. You just have to hope the kids of these Qanon white supremacists attend schools and community organizations that expose them a variety of viewpoints. I'm trying to do my part as an educator. Today was our last day of the first semester so I had my students complete an EOC Feedback form, and I was really humbled to hear a number my students thank me for discussing issues of race and inequality; including Confederates Statues, BLM and our nation's crippling history of white supremacism. Several said that they had never examined those issues from a historical perspective, and I teach at all-minority public school.
I've also tried in earnest for the last year to convince my retired elementary school mother who has become a FoxNews addict in her retirement, to not vote for Trump and I failed. She thinks all other news is fake news, that Biden is an Antifa puppet, and that socialist (lol) Kamala Harris (notice the POC is the true villain) will seize power by forcing Joe out and take away all of our freedoms. And she's a pretty tame "conservative". She has softened a lot of social issues over the years, is pro-LGBTQ now and at least claims to want equality for all people.
Now my uneducated rube family members are completely gone if their social media is to be believed. They think it is the end days now that Trump lost, their racism is no longer thinly veiled, and the support the "message", if not the actions, of the terrorists who stormed the Capitol. Lastly the two people I'm in contact with that are diagnosed with severe mental illness have both aggressively slid into the conspiracy theory Qanon alternate realty. It would not have surprised me at all to find out that they were in DC on 1/6 (they weren't, I don't think).