The incentive for the outsider is to attack the system right...

The incentive for the outsider is to attack the system right up to the moment he is co-opted by it. The incentive for the insider -and this took some getting used to- is to allow yourself to be attacked, and then co-opt your most ferocious attackers, and their best ideas. The effect on the system as a whole is to make it more stable, because everyone winds up working on its behalf.