Honest question: Let's say you had a neighbor who was always asking about your daughter and telling you how lovely she is. Then your daughter goes missing. Would you not want you neighbor questioned on the grounds that he was overly focused on your daughter?

Keep in mind that your hypothetical daughter is 20 years old, and there is nothing illegal or wrong with your neighbor liking her a little too much.

Follow up, another neighbor has magnets of a Ford Taurus. Do you think they should be questioned as well, with just as much urgency?