In general, I think it is easier to compromise your average developer. However, some individual developers might be impossible to compromise.

Lets assume there is a developer without anything to lose. A true autistic psychopath with very high disdain for anything but the truth. This developer would have no friends, family, and living in a place with difficult access. There would be very little leverage for those who want to compromise this person. Such an individual could withstand much more "stuff" than a group of developers.