This doesn't count as an answer to your question because aside from convincing 21st century whites living in first world countries, it's kind of a hard thing to pull off.

But similarly, did you know there's never been a act of geopolitical aggression that hasn't employed the use of a variant of the Black Legend? Think about it.

"The Jews were invading and subverting our governments because they have no homeland"

"Native Americans eat people, we HAVE to colonize them"

"The Moors are invading Spain, if we don't retake the holy land they'll never stop pushing us out of our homes"

"The Chinese will never grow up to be big and strong unless they buy enough opium"

"Gazans are a threat to the state of Israel, their religion is incompatible with us"

Kind of crazy to think that for a tactic as old as the human race, it never really gets called out when people in modern day just say it with their whole mouth.