How much repetition and shaming does it take to break a mind down?

Asking for a friend.

In all seriousness, though, we see ridiculous levels of repetition in media, of things many would be opposed to, and even worse levels of shaming you in that same media if you think those things are wrong, until the things become accepted or at least tolerated.

For a smaller scale example,

In my own life with someone who had learned to apply the technique to essentially everything...

They brought me into a security room and showed me video of my having entered that building about ten times.


First, they screamed and berated me for having been in the building.

Then they asked if I had been in the building, in a tone that indicated I should be deeply ashamed if I had been.

By the end of the two-hour session, I was sitting there, watching video of myself walk into the building on the screen, and swearing up and down that I would never do that and had never been in the building because I wasn't a bad person, despite the evidence in front of both of us.

By the very end, we walked out with me ready to argue vehemently and tell the world with 100% certainty that I had never been in that building, because I "wasn't that type of person."

Obviously, in my case, the effects eventually wore off. I know I had been in that building and will now admit to it. But in how many people do they fail to wear off?