The most powerful weapon in the world is PR.
However, there is a way to protect yourself from this. Nowadays, we live in a world where you can get almost all information directly from the source. You actually don’t have to believe any news site or random social media post. You can just check the data yourself, from the source. It’s very easy, actually. Most websites are quite easy to read.
What are people’s arguments against just checking the source themselves? I don’t really know. Maybe they think the source material would be hard to read. But that’s rarely true, and you can use a dictionary to look up the harder words when you do come across a few words you don’t know. Maybe people think that just reading or seeing a piece of news is sufficient. That’s also rarely true.
You can just find things out for yourself. It’s not even hard. If it’s about a person, you can find out from that person themselves or look up the actual facts from some website that just contains those facts (not articles or stories). If it’s about some world situation, there are almost always websites of some official agency that contains the current actual facts about it.
The danger to yourself is being attacked by PR. This is almost always more dangerous to you than whatever threat the PR claims exists. So go and educate yourself; that’s the best defense. The truth shall, indeed, set you free.