Allow me to be perverse for a few moments ...
Think about this. How many of your fellow astro club members are actually sick and twisted murderers just scouting the territory? How well do you
really know them? You never actually see their family there, right? (it's a cover story.) They're always cheerful and helpful, too helpful. (What are they hiding?) They drive a van or ute or station wagon. (It's easier to carry the bodies). They may even mask their evil designs by buying astro equipment. (It's just to gain your trust). And the longer you've seen them there, well you just know that shows how determined they are to get away with it ... waiting for the perfect isolated moment at that really dark site ...
We now return you to normal programming.