Human brains are very adaptive. Consider the following scenario: A person is standing on a stage, in front of many of their peers, giving a speech or receiving an award or some other public recognition. Someone comes up behind them and swiftly pantses them, dropping their pants and underwear instantly, exposing them nude from the waist down. Would you expect this event to result in psychological trauma to the person? The answer depends entirely and completely upon that persons prior experience. If the person has been raised as a nudist, and spent a great deal of time in their life nude in the presence of strangers, it would be a non-event on the level of sneezing. If the person has been raised the way most individuals in our society are raised, with tremendous social scorn and shame heaped upon every topic related to the body, with zero experience of being naked or witnessing nudity in a public setting... it could be monumentally traumatic and cause them intense psychological harm that lingers for decades. When society was familiar with violence, violence had less of an effect because of that. Now that violence is very rare, and we repeatedly insist to one another that things on a screen are basically the same as the things themselves (which we do with our language we use when talking about fictional depictions, using instead the words that would be more correct only if we were describing real in-person situations), we sensitize ourselves and invent the possibility of these images destroying us psychologically. It is a self-imposed weakness, but one which intellectual recognition of can do almost nothing to remove.