They aren't just sitting around stupid, anyway.
Not unless you intentionally stupify the AI at the lobby
However, they decide to bide their time too much if their only entrance point is too well guarded - 6 ion cannons, black hole machine, grav thingy, etc etc, the full zenith trade deal. Sometimes it's possible to bait them, sometimes not. Less 'fun' if you want the AI to attack you by trying to bait it with the break-in-the-wall style, I guess.