Totally agree, I think this is a good point. I just think at this point with the person missing for 2 months it might be time to be completely candid and explore all avenues if they really want the public's help. LE will find this information whether or not it is disclosed in a private group.
Since LE has stated publicly it wants the public's help finding DNV, I think they should release more information and ask specifically what they think will help them. Amber alerts are so effective when the criteria is met because you are giving a lot of people very specific information to look for. People are looking for a specific make and model of car, so you deputize thousands to millions of eyes on the road who can call in the specific piece of information you're looking for.
LE may not have information that specific but if they have any information at all where DNV's car went after the Shell Station, they should release it. Even as they did in Mollie's case, give people a few very specific areas of interest and ask anyone who was there to come in and you can question that narrow group further.