The incentive is not causing an even bigger mess and keeping their role. Contrary to popular belief, executives really are held accountable for outcomes.

It's a question of how much failure is visible and whether anyone else cares, including themselves. If they were only ever motivated by money, they might already have enough since so long ago that now they really only care about harsher legal action that money can't fix. Getting fired isn't a motivator anymore. That's a bad fit for any organization. Someone else is also dropping the ball there.