Plenty of people expressed the same doubts in 1950, with good reason. There hadn’t been any examples of successful democracies outside of a handful of countries. But to repeat the same racist canards in 2022 is shameful. You ignore the evidence of 70 years of successful democracy in tens of countries around the world.
Democracy backsliding is a recent worldwide phenomenon. Notice how few Americans have faith that the last election was conducted fairly. Notice how some Americans almost succeeded at violently overthrowing their government a year ago. And when they did, no one condescended to them by saying “oh, maybe it’s a racial thing”.