I do not think they are too stupid for using the bitcoin, the most are just way too scared to do it in my eyes.
They are scared to lose money with investing into the bitcoin itself, I'm really thinking this.
it is a really big possibility in my opinion, most of the people might be just too careful about bitcoins right now so they are afraid to spend any of their fiat into it
i think that people are not too stupid, they might be afraid of laws but they are definitely not too stupid because they would easily know how to use it as it is simple