The so called "useless" ones don't have a spawn point. They are created where the actual ai is when the client joins the game. The only useless ones that there are are the ones that the client sees moving. Those don't exist, you can stand there and get raped by it all you want but it won't do any damage. The ones that actually do damage and exists are completely invisible to the client.

It's not as simple as just using a script, if it was that simple it would have already been figured out.