Admissions committees analyze every single detail of your application, both positive and negative details. During my interviews last year, especially the HBS interview, I was asked about incredibly tiny details included in my app. It seems like one of your concerns is that by including your misdemeanor in the optional essay, you'll be drawing more attention to it. However, I think they are going to pay attention to it no matter what. By providing additional explanations showing your increased maturity, I think you would better be able to overcome the incident.
Also, I wouldn't wait for the interview. At Stanford, 88% of applicants won't even get an interview. You don't want to miss your chance to explain yourself.
All in all, however, I don't think this is a deal breaker. Just make sure that all other aspects of your app are strong, so that they understand this was a one-time thing that you did when you were young and you've since learned from your experience.
Posted from my mobile device