It's not really, if your neighbor still didn't believe you they wouldn't be able to detain you or keep hauling you into the house asking the same questions in different ways. Plus a life wasn't at stake it's just a door bell
Unfortunately, your post is high on emotion and low on fact.
First, prior to being made arguidos, the McCanns had published that they were returning to England. If they had done this move a bit faster, it is probable that they would not have been made arguidos.
Second, having been made arguidos, they were not restricted in their movement. Specifically, they were free to return to England, and that is what they rapidly did.
Third, a life was at stake. Madeleine's, not Kate's.
If you wish to defend a mother who spurned the opportunity to advance the search for Madeleine, go for it. This tells me that you are raising Kate's circumstances above those of Madeleine. And that is an arrangement I firmly reject.