No, the idea is that they went in aggressively, and their POI is acting like a targeted person now and trying to protect himself...guilty or not. There are other ways to do this, we have seen it in other cases. LE chose this route, and now they have a POI that doesn't seem to want to talk to them and it is my belief it started with searching his car.
That is their job. When an 18 year old girl is missing, and police have a lead, they will pursue it.
I sure hope that JM wasn't surprised after seeing himself on video, knowing that he took her to Tempo, and that he left with her ... knowing that 18 year old girl vanished from the face of the earth after he was seen with her. Was he actually surprised that police found him? Did he really think that police would not eventually want to talk with him? Did he think that he would slip through the cracks because his grandmother loves him, he eats his greens, and apparently he knows how to find a church?
Why didn't he come forward immediately upon realizing that the girl he had drinks with on Friday was missing?