Why can't pax accept what they're told without assuming they're being lied to?
Perhaps you need a reality check; an a station/area/handling manager I've lied to passengers, for good and bad motives, hundreds if not thousands of times in the past, and every time I fly now I hear exactly the same lies given by handling and cabin staff. I am well aware that in most cases they are telling the lie they are told to tell, sometimes without having the experience, knowledge or nous to actually know that it's a porkie.
Lies about why an aircraft is late/broken/missing/never existed, and lies about why a flight is delayed/cancelled/rescheduled/overbooked are the most common and, unfortunately, are frequently driven by an ill-informed notion of not incurring extra costs in the form of claims by passengers and shippers.