I agree. Common courtesy goes a long way. We're taught to be friendly and polite. I always try to have a smile on my face, b/c I keep in mind that if it weren't for people buying plane tickets, I would be out of a job. Those screeners who are rude and scowling should be in another industry, since we are working with people. Same for people who work in traditional customer service positions, such as cashiers, waiters, etc. It can be hard to keep smiling when people are cursing at you and throwing things at you, but I still try to be friendly...most passengers are friendly and cooperative. As for trust, I, for one, have never worried about a pilot possibly compromising my safety. Otherwise, I'd never get on a plane.