Gorb
Yes, I think the JW experience can leave us all pretty jaded about people's motives. But like anything, there should be an avoidance of going to extremes on one side of the ditch or the other--from distrusting everyone and their intentions to the other extreme of being overly trusting of fallible people. It sounds like you feel you are toward the distrust extreme and it is hindering your effectiveness as a manager.
I don't know where you are spiritually, but the bible is quite honest about the human heart's propensity toward self-centeredness, and therefore instructs us not to place our entire trust in man, but rather instructs us to place our entire trust in God, who as God, has perfect integrity. In light of this, that wisdom helps me consider a person's overall character--are they themselves trustworthy, are they hard workers, are they conscientious, etc. Like AtLeastImNot says, actions speak louder than words, and they respected the people that were honest and I'm assuming granted them a level of trust not available to the employees who acted like fools.
For me a big help in overcoming extreme distrust was forgiving people that have hurt me, and recognizing that "to err is human, to forgive divine." I think deep down my distrust of other people was rooted in the fear that if I could let myself be hurt or misled by another person that there was something wrong with my ability to judge correctly--I blamed it on myself--I kept questioning my own judgement. It seems my inclination is to remember all the times I get it wrong, and not the times I get it right.
Anyway, I don't know if any of this helps you or not, but it has helped me to have a more balanced view of other people, and myself for that matter.