Couple of interesting twitter threads on this from Tyler (The Drive). He suggests this has been coming/happening for some time. https://twitter.com/aviation_intel/status/162414986417840128... Also that we are seeing a lot more now because we have turned down/off the filters on the radars. Which means also we can expect a lot more false positives. https://twitter.com/aviation_intel/status/162461466198661120...
That's easy to say, but does anyone know how many objects appear when you drop the filter? Yes, the military has a huge budget, but it's not unlimited. My guess is when you lower the filter you're met with so many objects that you couldn't possibly address them all with the resources you have available.
Imagine you have 10 resources to deploy and a screen with 100 objects to investigate. You lower the filter and there are now a million objects to investigate. It's not hard to understand why the filters were in place and saying they were "asleep" is silly. There have probably been people at the DoD asking for more resources ($) to remove the filters for years.