You've got to remember that each host, depending on it's position on the map, basically as a different set of abilities. Soldier guys are obviously trained to fight, whereas little ol' damsel Delores isn't supposed to do anything but die or be saved. Remember the woodcutter? All those guys were in a loop because none of them were allowed to even TOUCH an axe to chop wood, but the other guy was. I'm sure all the people out farther in the park can fuck your shit up. You can even see some hosts in Sweetwater can't do anything but lazily tackle you and kind of wrestle for your gun.
It's like civilian NPC's in towns. Some will never fight back, some will just run away, but if you stop attacking "Fish Monger Alvin" and start attacking "General AssKick McLordington" you're going to get your shit rocked.