I look at it from the opposite perspective.

If you were a foreign power running things in military ranges that gave odd sensor readings (say, balloons with radar characterization gear), wouldn't it be convenient if your adversary dismissed reports as fanciful?

The fact is that any contact in a military range, where militarily valuable radar and signal emissions abound, is a threat to national security.

Gear is going to malfunction and throw off a non-zero number of false positives. But any contact is important enough that it at least deserves to have a report taken and logged on it.