He's suggesting that working someplace where part of the job description is scanning people's brains would be likely to increase your chances of being scanned yourself, since it would probably be required as part of a job interview.

I think I've fallen in love with my scenario, but I'm going to run with it anyway.

People in charge typically aren't tested. CEOs can do much more damage than bus drivers, but it's the latter who get drug-tested.

I was thinking of psychopaths targeting being in charge of the project from the beginning, but you're probably right that most of them aren't that self-aware.

On the other hand, you only need one. In fact, that would work better for that psychopath's self-interest than if a number of them were competing for the spot.

Obvious bias: I read Slan at an impressionable age.