In this case, it's a matter of social expectations driven by the timing of that honesty:
* If someone is a completely unfiltered person and says the information audaciously and openly, the interviewer may simply see they have nothing to hide.
* On the other hand, if the person looks anxious (which could literally be nothing more than PTSD), then awkwardly blurts out the information, they may be interpreted as having more to hide, making that honesty appear worse than it is. Ironically, that was probably the optics that got my felony in the first place.