Hey ... I use a pretty default config and just some added rules (that may be a bit recursive too)... but I can't do anything to hurt the guards there ... so what did I miss? I thought the "guards" related rules should fix it...

      "name": "default",
      "enabled": true,
      "defaultAllowDamage": false,
      "flags": "AuthorizedDamage, HumanNPCDamage, LockedBoxesImmortal, LockedDoorsImmortal, SamSitesIgnorePlayers, TrapsIgnorePlayers, TurretsIgnorePlayers, SelfDamage",
      "rules": [
        "anything can hurt dispensers",
        "anything can hurt resources",
        "anything can hurt barricades",
        "anything can hurt traps",
        "anything can hurt heli",
        "anything can hurt npcs",
        "anything can hurt players",
        "anything can hurt ch47",
        "anything can hurt cars",
        "anything can hurt mini",
        "anything can hurt guards",
        "anything can hurt ridablehorses",
        "cars cannot hurt player",
        "mini cannot hurt player",
        "ch47 cannot hurt player",
        "scrapheli cannot hurt players",
        "players cannot hurt players",
        "players can hurt traps",
        "guards can hurt players",
		"npcs can hurt players",
		"players can hurt guards",
		"players can hurt npcs",
        "fire can hurt players",
        "traps cannot hurt players",
        "highwalls can hurt players",
        "barricades can hurt players",
        "mini cannot hurt mini",
        "players can hurt cars"​

It's part of vanilla now. You can't hurt players (including npc players) in a safe zone unless they're hostile or are hurting themselves

			if (InSafeZone() && !IsHostile() && (UnityEngine.Object)info.Initiator != (UnityEngine.Object)null && (UnityEngine.Object)info.Initiator != (UnityEngine.Object)this)
			{
				info.damageTypes.ScaleAll(0f);
			}​

I could bypass it. Why do you want to allow this?

OHH.... lol thanks for clearing that! That makes sense. I was on pause from rust for a while and I was pretty sure it was possible to shoot them down (why ever it would be a thing to do). So I thought it was kinda blocked by mod. False ... it's not the mod and so it's not something to set up - I'll just let it vanilla.
So ... no - I wouldn't have any valid need in mind. Thank you :)