Say they've been given money to conduct such an experiment. Then, if possible, What can politicians/propagandists who feel like brainwashing do in order to ingrain in people's heads this kind of selfpolicing? Or selfdestruct instinct that will last their entire lives.

It must be just like how most people automatically feel repulsed by those who say the n-word and the r-word in public. And like even little ones will call people hurtful names but they won't use those two words (typically, not always). So that level of selfchecking.

So an example of what they plan to achieve would be, they want to make people move away from or stop talking to anyone who says in public "You're [some transphobic/ ablest/ ageist/ xenophobic/ remark]." Or idk make bullying become uncool or whatever. There must not be actual policing or violence.