It isn’t about the greater idea, it’s about the small lies you don’t know you’re accepting. Of course that isn’t to say you can’t engage at all with this content (I certainly seek out people who disagree with me.) as you say, with constant effort and confirming everything you’ll catch most of it. No matter what you’re going to end up believing something without confirming it or even realising it. Good propaganda goes unquestioned. It seems like something obvious, small, and in some base way unquestionable.
In a torrential downfall there’s no way to catch each raindrop, no umbrella that can block it all. You are going to get wet, even just a little.