It is clear to me we are under attack. This is an attack by a foreign government to sow chaos and fear, and they use various other tactics to achieve this as well. They are likely attacking us in ways that hurt us economically also. It appears the technology makes it easy to track and attack individuals, even without them being aware of it. I believe it can do so many things, including creating physical effects and potentially causing changes to peoples brains.
Addionally, I found this from the Naval Postgraduate school that demonstrates a technology that makes it theoretically possible to put sounds / voices in someone's head that can't be heard by others. Again, I don't believe this would be coming from the US government - it (or more likely something like it, possibly using the microwave auditory effect) could be transmitted from anywhere via satellite (or even some other method) that is highly sophisticated and computer aided. And I doubt the US would be demonstrating it if they were using it negatively against anyone, particularly it's own citizens.