I wont fault people for lacking a basic understanding of science but at least using basic fact checking should be doable. Like maybe google "microwave attacks snopes" or something: https://www.snopes.com/fact-check/do-sonic-weapons-explain-t... (Written in 2017(!) but hey just lets just warm up the story again and again). I am sorry for being snarky but between having to explain grown ass adults why they should wear…
But we are now in the situation that media in Europe are lying every day about the constant violence used by the police in Paris (and Brussels, and Madrid, and ...) against COVID-protestors. For example, just from today:
https://twitter.com/KevinTONON_/status/1388575836387880965
(Paris is usually much worse btw)
So you cannot trust these messages. Your argument is essentially an appeal to an authority. It is critically dependent on the authority not lying, and not leaving out critical information, and since you have no ability to figure out what they would lie about (and the State Dept has lied about their own people getting hurt and the causes many times).
That doesn't mean other sources are believable or not. The sources of these conspiracies do mean
1) people who were here were hurt.
2) the state department is not helping them.
3) the purpose of these denial messages is, at least in part, to justify 2).
I'm willing to bet that you at the very least think 2) is not true. So your careful fact checking has in fact lead you astray as well, because authorities, just like anyone else, serve their own interests.