Firstly, propaganda is not all lies. It’s public relations. Sometimes it is lies though and a good example of that itself, is the notion that propaganda is all lies. We use the word propaganda (nowadays) primarily for the enemy’s public relations.
So, it’s not necessarily about what it demonstrably right or wrong, but has the US public been subjected to propaganda and has that affected some people’s ideas? Well, it used to be pretty normal for fairly well informed and thoughtful people who were less exposed to public relations to suspect that Russia would be threatened by NATO expansion and, feeling threatened might be aggressive. That absolutely was not limited to John Mearshimer and SenorKeeed. And when they expressed those ideas, other people didn’t find them controversial. Here’s an example of it from back in December:
I don’t think any NATO countries border Russia. Russia really wouldn’t like that, and it’s why they are thinking about conquering Ukraine rather than let them go to NATO.
That’s you saying that. I can’t quote it because the older thread is locked. December isn’t that long ago, but it was before the drums of war were beating so loudly and it was before that idea was so severely frowned upon. A few months, a lot of “let me be clear” press conferences, and a lot of blue checkmark tweets later and people may not even remember that they even had those thoughts.