Some of your speculation is incorrect, while other is questionable. The white house has been targeted. The current U.S. case count is up to 300, and, at least based on news reporting, appears to affect multiple staff in a location. This makes a great deal of sense, as it would cripple intelligence work in that geographical area. The top level decision makers won't have any Intel on which to make decisions, but they're not being attacked directly, so it's not that big of a deal.
As for not affecting other organic matter, we've heard it causes brain damage, but nobody has mentioned so much as a sunburn. Would you expect pulsed RF with those effects to kill grass or plants?
As for the equipment being non-trivial, are you sure it can't be created with run-of-the-mill industrial electronics, flown in on a private jet, or shipped inside a diplomatic crate?
WH: https://www.cnn.com/2021/05/17...
300: https://www.abc.net.au/news/20...
Vienna: https://www.bbc.com/news/world...
Diplomatic bag: https://en.wikipedia.org/wiki/...