I recently saw “Rampage” from 2009. Its basically a movie where a spree shooter is portrayed as the good guy/anti-hero. Several parts gave me that pit in your stomach, teeth gritting uncomfortable moment. I really hated it. Although I’m not surprised there are sequals I am disappointed and will not be watching them.
I found some scenes from the movie ‘Amistad’ (1997) deeply disturbing, and they haunt me to this day (as they should any sane human being).