Every person has a breaking point, especially if they have people they love. It is much smarter to stay under the radar, like Satoshi.
And if you cannot, then factor people's potential weakness into the equation and find a way to mitigate the risk.
I listened to a BTC core dev talk on a podcast recently and he said they are all paranoid and expect to have code submitted by compromised colleagues. So they thoroughly review, rather than try to vet and find devs which are unbreakable.
