One must be careful of the things they become desensitized to. If you had spent more time around mobsters, you would become more accepting of their lifestyle as well. Killing people to send a message, or doing whatever else it takes to maintain power in a certain area becomes more acceptable when you see it enough times. That's why it's important to not expose yourself to things that are wrong, even if those who shape your environment accept and promote them.
Even soldiers in the military become desensitized to violence after awhile, especially after experiencing combat. Same goes for police officers who see things most people never have to see. In fact, they have to desensitize themselves to it or they'd go crazy. But for police and military, it's necessary for doing the job.
And yes, I could become desensitized to the gay lifestyle, and then transsexuality, and even overt sexual fetishes to the point of flaunting it out in the street in front of children in a parade. After that, I could even start believing what those people could tell me about "Minor attracted persons" and become desensitized to that idea as well---IF I allowed myself to be around such people and propaganda. That's why it's important to stay away from it. Because.....
Some things are evil, and we need to recognize it so that we don't get deceived into accepting/promoting it.
Our entire society has become desensitized to all sorts of sexual deviancy because it's introduced incrementally, and with convincing propaganda. Even suicide is starting to be promoted. Those who are ready to be desensitized to that idea will begin accepting that as well, and will promote it. There is really no limit as to what people can become desensitized to.