Yes, education is the key. It pretty much is in many other cases as well. People should be taught to be more skeptical and not assume what they read is correct (or to trust the source of the content), because that’s pretty much the case in most of my experiences. Then again there’s only so much you can educate a person, or people may only want to be educated a certain amount. No amount of education can help a truly gullible person unless that person wants to change their behavior.
Your personal story is interesting, but I do not agree with your logic of taking responsibility for his possible death. You can’t be responsible for other people and their actions, or other people’s happiness. Well, you can, but you will end up living your life for other people instead of yourself. You can offer them help, you can listen to them, and you can offer them a shoulder to lean on, but what they ultimately choose to do is their own decision no matter how much you try to influence it.
I do think it’s illogical. Imagine being a psychiatrist, you have all sorts of people, troubled and not, telling you all sorts of things. If a troubled person who talks with this psychiatrist ends up killing themselves, it’s probably not because of what the psychiatrist said, it’s because that person was troubled to begin with.