In my mind, NPCs are disposable, and if anyone wants to kill an NPC of mine. We can discuss that and figure out what makes sense, why, and what happens. However, I do have equal rights equal fights type of thinking, so you are not allowed to just off an NPC without consequences (be that one of yours gets killed to, etc...).
Plus, NPCs create layers. Like an onion or an ogre. Great layers.
I can cap myself until someone wants to kill a few. If it is an actual problem. I just can handle stringing NPCs in and out of a story. I could make them all characters and string them in and out of the story too. But I won't make anymore until a few die off. I suppose.
Edit:
I asked Est to remove the three NPCs that I created so I will only have the original ones, for the most part, and will not have too many. I apologize for making so many. I wasn't trying to cause issues.