Becoming a usual suspect is only a circumstance. A subjective circumstance that doesn't depend on the cause of the suspicion, or on who brings it up, it just depends on who presumes it. And that suspicion anchors in the person of the usual suspect a perennial and insurmountable label; maybe without even making a first little mistake that starts it. And maybe, also, that a different person, foreign to that presumption, even making lots of little mistakes, avoids it for good.