What does it say about me that I've seen so much stuff like this that it barely affects me? I'm in my 30s and have had unfiltered internet access since I was about 8.

Gore definitely made me a depressed person in grade school, but the only reaction I'm having to this is concern about: - conservatives getting ready for violence - the state getting ready to use this to further erode civil liberties - the left fanning the flames for conservatives

Desensitization isn't a profound or "bad" phenomenon in of itself. Humans adapt to their environment and focus more on concerns of a surprising nature.