Simply because they are too afraid to use a new kind of technology that can get our lives more easier. They are basically scared or being cautious about taking and applying cryptocurrency to daily lives. They think this technology must be fully researched and understand its limits and full capability of cryptocurrency and blockchain technology.
I think lack of knowledge is the main reasons why a lot of people in most countries were hesitant to adopt crypto. The government also doesn't recognize crypto due to negative speculations mainly on FUD and other crimes related to fraudulent acts that victimized a lot of people. I think that's a big problem that crypto were facing right now, and with an ample ways that eliminates crypto problems we really need to apply crypto together with the help of the authority.