Most people are less than well disposed to people who attack them.
And many NPCs have things like "Helps allies and friends" in their AI behavior..so if your NPC attacks an NPC with lots of allies around, there you go.
That makes perfect sense. But why then, do these new actors that I create with PlaceAtMe() show up as hostile red dots on my compass, and get red health bars when I look at them? And why are my darn followers and summons attacking it?
When I tested this, I attack a guard in a city. Of course, as usual, they get all pissy and 3-4 guards show up and wail on me. However, all the citizens, which I have not attacked yet, go running in all directions, and are NOT hostile to me yet! Then, I cast the spell, and actors get created and rush out to engage the guards that are attacking me while I channel the spell. All the sudden, the citizens decide they want to take up arms and attack them!
They didn't mind when I cleaved a guard in two with my axe, but as soon as I make a skeleton, they get all pissy and want to murder it on sight. And the moment the skeleton goes away, the citizens (and my followers) put away their weapons and return to their lives! Well, not my followers and summons, they keep their weapons out and charge at the next guard to attack me.
How do I get these guys to be on my team? They aren't attacking me because I am using frequent updates to force them to attack a specific target, but if I didn't do that, I am almost positive they would attack me given the chance despite being in my faction!