* old cold-war boogeyman
* claims of attacks that leave no physical evidence
* only reported by government officials
If the tables were turned here and the Cubans or Russians were accusing us of a sonic attack we’d be screaming that it’s a disinformation campaign.
I do not follow Cuban politics (and not much Russian), but Russia nowadays are always accusing USA of some evil -- watch the official 1st channel or read gov't radio transcript: planning an overthrow of their government (via supporting this or that NGO), destabilizing an economy, financing a war and killing Russian citizens (Ukraine, Syria), etc. etc.
Much of this is for internal consumption, and generally the reaction in the US from those who can read it and care to is "meh, business as usual". Trying to influence minds, for sure; but this is par for the course for politics.
Our official sources are happy to demur, as they have around claims of sonic attacks - we are still “investigating” and “analyzing data”. We officially keep the claims at arms length.
We’ve figured out that a public-private partnership makes better agitprop.
I think more likely the state department would just deny it and move on.
And yet, there are bad guys. Churchill was a bastard, and no kind of “good guy” yet Hitler and the Nazis were the bad guys. C‘est la vie. Stalin was one of the bad guys, and so was Slobodan Milosovic, and so is Dick Cheney, Tony Blair, Pol Pot, etc. Good guy is a tough category to fill, but history is full of inexcusable monsters and we should be careful with our moral relativism.
But I agree with your main point. There is real evil out there and we have a moral prerogative to stop/fight/kill those people.
The USA is hardly spotless, but they have a good reputation of standing up to real evil in the world.