First four are just red herrings. The last headline is actually what the show is about.

Now try to imagine how your son would behave believing in a high probability that anyone at any time could just disappear.

If they're like labrats that have ongoing testing and monitoring, it's possible that it was done to them to control the experiment.  Sarah was off their radar for whatever reason (taken from the program and given to her foster mother to hide her?) and seems to have a spotty past of dropping all contact with people and…