you can hog tie said Prostitute and strap her to train tracks for a gruesome death
I love the fact that it's not just possible, but there's actually an achievement for it, called "Dastardly."
But speaking of that, another big improvement (for me) over GTA is that you can play RDR as a Clint Eastwood or a Lee Van Cleef--you're not forced to be a bad guy like in GTA. I chose to be a "good guy" (well, relatively), and tried to maintain my honor as much as possible, so I never killed nobody who didn't need killing.
So, the day some lady on the trail stopped me to help her, and it turned out she was lying so so she and her partners could rob me, well, that's the day I collected the achievement.