To much risk when you end up being the loser, cost too many lives or careers in the administration.

And besides, how much energy would such a weapon like PEPS need in order to splash that much energy all over the place. You'd probably end up getting just as much bang for your buck - if not more - to use more conventional methods magnified to bigger extents. Or just go with brown noise or [url=https://en.wikipedia.org/wiki/Active_Denial_System]ADS[/url].