I'll comment on this statement:
The person is dehumanized and violence then becomes inevitable.
Rhythm 0, 1974
The artist Marina Abramović did an exhibition, Rhythm 0, 1974. The following as described by Wikipedia:
To test the limits of the relationship between performer and audience, Abramović developed one of her most challenging (and best-known) performances. She assigned a passive role to herself, with the public being the force which would act on her.
Abramović had placed upon a table 72 objects that people were allowed to use (a sign informed them) in any way that they chose. Some of these were objects that could give pleasure, while others could be wielded to inflict pain, or to harm her. Among them were a rose, a feather, honey, a whip, scissors, a scalpel, a gun and a single bullet. For six hours the artist allowed the audience members to manipulate her body and actions.
Initially, members of the audience reacted with caution and modesty, but as time passed (and the artist remained impassive) people began to act more aggressively. As Abramović described it later:
“What I learned was that... if you leave it up to the audience, they can kill you.” ... “I felt really violated: they cut up my clothes, stuck rose thorns in my stomach, one person aimed the gun at my head, and another took it away. It created an aggressive atmosphere. After exactly 6 hours, as planned, I stood up and started walking toward the audience. Everyone ran away, to escape an actual confrontation.”
There's an audio explanation of the results of the exhibition here:
Where she describes people cutting her skin, drinking her blood, stabbing the knife between her legs, putting a bullet in the gun posing it to shoot herself and asking her if she would resist.
Stanford Prison Experiment
You also have the Stanford Prison Experiment:
Twelve of the 24 participants were assigned the role of prisoner (9 plus 3 alternates), while the other twelve were assigned the role of guard (also 9 plus 3 alternates). Zimbardo took on the role of the superintendent, and an undergraduate research assistant the role of the warden. Zimbardo designed the experiment in order to induce disorientation, depersonalization and deindividualization in the participants.
The researchers held an orientation session for guards the day before the experiment, during which they instructed them not to physically harm the prisoners. In the footage of the study, Zimbardo can be seen talking to the guards: "You can create in the prisoners feelings of boredom, a sense of fear to some degree, you can create a notion of arbitrariness that their life is totally controlled by us, by the system, you, me, and they'll have no privacy... We're going to take away their individuality in various ways. In general what all this leads to is a sense of powerlessness. That is, in this situation we'll have all the power and they'll have none."
After a relatively uneventful first day, on the second day the prisoners in Cell 1 blockaded their cell door with their beds and took off their stocking caps, refusing to come out or follow the guards' instructions. Guards from other shifts volunteered to work extra hours in order to assist in subduing the revolt, and subsequently attacked the prisoners with fire extinguishers without being supervised by the research staff. Finding that handling nine cell mates with only three guards per shift was challenging, one of the guards suggested that they use psychological tactics to control them. They set up a "privilege cell" in which prisoners who were not involved in the riot were treated with special rewards, such as higher quality meals. The "privileged" inmates chose not to eat the meal in order to stay uniform with their fellow prisoners. After only 36 hours, one prisoner began to act "crazy", as Zimbardo described: "#8612 then began to act crazy, to scream, to curse, to go into a rage that seemed out of control. It took quite a while before we became convinced that he was really suffering and that we had to release him."
Guards forced the prisoners to repeat their assigned numbers in order to reinforce the idea that this was their new identity. Guards soon used these prisoner counts to harass the prisoners, using physical punishment such as protracted exercise for errors in the prisoner count. Sanitary conditions declined rapidly, exacerbated by the guards' refusal to allow some prisoners to urinate or defecate anywhere but in a bucket placed in their cell. As punishment, the guards would not let the prisoners empty the sanitation bucket. Mattresses were a valued item in the prison, so the guards would punish prisoners by removing their mattresses, leaving them to sleep on concrete. Some prisoners were forced to be naked as a method of degradation. Several guards became increasingly cruel as the experiment continued; experimenters reported that approximately one-third of the guards exhibited genuine sadistic tendencies. Most of the guards were upset when the experiment concluded after only 6 days.
Zimbardo aborted the experiment early when Christina Maslach, a graduate student in psychology whom he was dating (and later married), objected to the conditions of the prison after she was introduced to the experiment to conduct interviews. Zimbardo noted that, of more than fifty people who had observed the experiment, Maslach was the only one who questioned its morality. After only six days of a planned two weeks' duration, the Stanford Prison experiment was discontinued.
While the Stanford Prison Experiment was only roleplay, it went into real violence and humiliation in less than a week.
Do note that the Stanford Prison Experiment has also been criticized as being anecdotal, and the experimenter Zimbardo was personally involved in the experiment itself.
However, this is towards proving that dehumanization causes violence. I don't think sexy ads are dehumanizing, which might be the flaw in the line of thinking.