The fact is, the office isn't unsafe, so is there a way to tell that inner kiddo that they are going to have to deal with their "feeling", since it isn't a reality, so you can move on. I mean, if this was one of my own children or a student, there would come a point where as a parent you just have to tell them it is time to deal with the discomfort and move on. You can only be so accommodating to this; there comes a point where continuing to indulge the obsession of the safety issue doesn't do the kid any favors--it just feeds it.