I am able to spawn scarcrows and murderers but they chase players and dont attack. Would there be a command to enable this?

Looking for spawned units to attack players. I'm guessing an npc command?

The components that control them got removed when they updated the NPC AI. You could try adding the new AI components to them but I have no idea if that will work.

how does one go about adding a new AI Component?

Something like:

someObject.AddComponent<ComponentName>();​

Check out plugins like night zombies.