Germans are excited by finding one arrowhead

I continue to be puzzled by the observation that Europe has almost no arrowheads. Here, a single one is considered an outstanding discovery:

Rare 4,500-year-old Stone Age artifact found in Germany | Miami Herald

 Looks like a face, looking out into the water. Seems kind of deliberate.

(Woods Hole, MA in the background).

The Fort Sage Drift Fence

A stone wall north of Reno Nevada, somehow is date-able as 3K years old. 

Question: What do they know out there that, somehow, eludes our New England "experts"?

Visit a 3,000 year old abandoned prehistoric structure that nobody talks about – near Reno, Nevada!

Answer: They find arrowheads along the wall.