I had a related idea about vaccination back during COVID. Have Hillary Clinton be quoted saying nobody should be vaccinated and the "Trump vaccine" is bogus. Then have Trump be quoted saying nobody should be vaccinated and the "fake Democrat vaccine" is bogus. Result: everyone gets vaccinated.

A negative version of this, I think, is mandatory diversity education and DEI, which had the effect of making racism and fascism cool and countercultural among the youth. Deplatforming had the same effect. "It's being banned which means it's what THEY don't want you to know!" The big wave of deplatforming in 2019 and 2020 probably helped Trump win in 2024 by way of the Streisand effect.