I'm not that in depth with the lore of the game so forgive me if i sound stupid.

But from my understanding, the old AIs were infected with a virus that made them "rogue" and could potentially wipe out all of humanity.

So Netwatch created the Blackwall to cut off all of the rogue AIs from the Net.

My question is.. if they're that skilled to create AI thats powerful enough to imprison all of those rogue AI, couldn't they have made another AI to wipe out all of the rogue ones?

I've heard thats there's AI that can control other AI, or that the virus could spread to other AI.
If thats the case, then how is the Blackwall still up and running?