True, hard to draw a firm conclusion because of that point. Based on the 'leaflet' they provide when you are detained refusing to hand over passwords can lead to arrest so I drew the conclusion based on that. If we look at it the other way though (based on your point) it's also scary as if they are detaining people who then refuse to give passwords and they don't arrest them (which they have the right to do) why are those people being detained at all? Again, the correct answer if we don't know but it could speak to some degree of racial profiling or simply very poor/incompetent screening that's catching and inconveniencing a lot of people.