For most people bitcoin seems to be dangerous. It's online money and people don't fully understand or trust online.
Think about the hacks/ criminals that happen. Most people are just scared.
I have introduced this forum to two of my colleagues and they were just like, "What?", "Uhm, Okay.", "Lame.", "Scam." and "No proof.". I have no proof to show them about the money in my wallet because I'm still waiting for the halving before I withdraw my coins. Oh well, it seems that it is a fact that people are scared of what they don't understand. If they can't understand a thing, they will just leave it as "not understood" instead of trying to work on it, and actually learning and understanding the whole thing.