It's okay, there are a number of people in this thread who haven't. The interesting part is, legally, how there are two separate parts: intent (I intended to do this action, why car accidents are not murder) and knowledge (I knew, or should have known, this was a crime).
In this case, they could not form mens rea because, to their knowledge, they had permission to "break into" the building. Like when you lock yourself out of your house and hire a locksmith to "break in". The locksmith has intent, but no "criminal knowledge" because you gave them permission.
